community patterns b section - prairie trailcommunity patterns 10 attached house lots lot types...

s e c t i o n b Community Patterns

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Overviewc o m m u n i t y p a t t e r n s 1

the community patterns section provides specific require-

ments for placing buildings on their lots within the plan. These guidelines

were developed as part of the master planning process and are meant to

ensure that the diversity and character of Prairie Trail is supported in the

implementation of the plan.

This user-friendly section begins with descriptions of the addresses within

the plan that give Prairie Trail its unique character. The plan is composed of a

continuous sequence of public spaces diverse in their character and quality.

Each public space, or Address, is illustrated with a detailed plan, street section

and perspective. The design of the streets, the placement of the buildings and

the landscape are arranged in different ways to create distinct addresses that

enrich the neighborhood.

The neighborhoods of Prairie Trail have a variety of Lot Types which

accommodate a range of house sizes. The lot types are located in the Lot

Type Plan. The rules for each lot type are described on the following pages

and include the placement of buildings, location of setbacks, facade zones and

yards, access, parking, and screening.

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Addresses Within the Planc o m m u n i t y p a t t e r n s 2

Addressesthe prairie trail plan will include several special addresses that

give unique character to each part of the plan and provide a diverse set of

experiences as one travels through the neighborhood. Each address will be

defined by its particular arrangement of house types, the way the houses

address the street, and the particular streetscape of that zone. They will also

vary depending on their location around special features such as parks or the

Town Square. Community centers will also be established to serve as focal

points for the neighborhoods and gathering places for Prairie Trail residents.

The addresses described in this section are:

A Neighborhood Streets F Shopping Street

B Parkways G Community Park

C Residential Court H High Density Residential

D Crescent Park I Business Park

E Town Square J Commercial Out Parcel

Address locations for the Prairie Trail Community

Neighborhood

Street

Crescent

Park

Residential

CourtParkway

Sta

te S

treet

Shopping

Street

Town

Square

Community

Park

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Neighborhood Streetsc o m m u n i t y p a t t e r n s 3

Typical Prairie Trail neighborhood street section

Detail plan of neighborhood streets View along a typical neighborhood street

The neighborhood streets in PrairieTrail build on the great traditions ofIowa neighborhoods. The streets arepedestrian-friendly with generoustree lawns and continuous side-walks. The streets are designed todiscourage speeding and accommo-date on-street parking. Parking ineach lot will be rear-loaded fromalleys for smaller lots and front- VARIES 5' 8' 8'10' 5' VARIES10'7'

loaded from the street in larger lots.Garages will be behind the houses.Front yard depths vary based onlocal conditions. Each street will beunique in character with a richinventory of houses that build on thearchitectural traditions of the great-est neighborhoods in the DesMoines area.

55'

ROW

1' 1'

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Parkwayc o m m u n i t y p a t t e r n s 4

Typical Parkway section

Detail plan of parkway address View along parkway

Prairie Trail is designed with a seriesof natural open space corridors thatprovide a range of open spacesincluding water courses, restoredprairie, passive and more activerecreation areas and trails. Thesecorridors are signature addresses andgreat amenities for the adjoiningneighborhoods. Winding streets fol-low the edges of these corridors and

are fronted by houses with greatviews of the open space. The streetsare typically collector streets and arewider to accommodate higher trafficvolumes. Houses are set back fromthe street with deeper front yards.The landscape transitions fromnative plant species in the openspace corridors to manicured frontlawns.

VARIES 5' 8' 8' 5'- 8' VARIES22'7'

29'- 36'

ROW varies

1' 1'

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Residential Courtc o m m u n i t y p a t t e r n s 5

Detail plan of residential court A view of a typical residential court

The residential courts are the most inti-mate addresses in Prairie Trail and fol-low a rich tradition of courtyardhousing in America. Small houses aregrouped around a shared front lawn,creating a quiet semi-private garden set-ting. The houses are designed withporches which face a circumambulating

walk that connects to the street. Thecourts feature an attractive center lawnwith flowering trees and garden beds.Parking for each lot is accessible fromalleys behind the houses. Each court isdistinguished by the houses which sharea common architectural vocabulary.

Section through a residential court

VARIES 5' 5' VARIES50'

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Crescent Parkc o m m u n i t y p a t t e r n s 6

Detail plan of Crescent Park A view of Crescent Park pavilion and Address

Crescent Park is a large park addresslocated in the center of the neighbor-hood. A pair of streets form a continu-ous green that connects two major openspace corridors. The streets diverge toform the park which is wide enough fora passive open space, a central garden

and curving trails that converge on acentral pavilion. The pavilion is thevisual terminus of an intersecting neigh-borhood street. A curving line of houseswith distinctive architectural characterwill enclose Crescent Park.

Street section through Crescent Park

VARIES 5' PARK VARIES9' 18' 9' 5' 18' 9' 5' VARIES

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Town Squarec o m m u n i t y p a t t e r n s 7

Street section through the Town Square

Detail plan of the Town Square

At the heart of Prairie Trail’s town cen-ter is a traditional Iowa Town Square,similar in dimension and proportion toWinterset, Adel and other well-knowntowns in the region. Several streets con-verge on the square from surroundingresidential neighborhoods. Diagonalparking and generous sidewalks sur-round the square. The square isdesigned to accommodate a variety ofcommunity activities for Ankeny,

including community concerts, open airmarkets and ice skating. Major civicbuildings lined with shops are locatedon one side of the square. Major retailanchors are located on the remainingthree sides behind small shops andrestaurants. The architecture of the townsquare is based on Iowa precedents withsecond and third floor offices and loftresidential units.

An aerial view of the Prairie Trail Town Center with the Town Square as its focal point

16' 4'12' 18' VARIES12'18'

80'

ROW

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Shopping Streetc o m m u n i t y p a t t e r n s 8

Typical street section through a shopping street

Detail plan of a shopping street

The retail streets leading into the TownSquare are important pedestrian andvehicular connections between residen-tial neighborhoods, parking areas andthe Town Center. Designed with widesidewalks and on-street parking, thesestreets will be lined with shops andrestaurants. The streets also provideentries to major retail anchors. Some of

the streets are wide enough for diagonalparking on one side and parallel parkingon the other. Entry points to majormid-block parking areas are located onthese streets for both pedestrians andvehicles. Parking and service areas willbe screened from the streets with build-ings, walls, and landscaping.

Aerial view of a shopping street

15' 8'12' 15'12'18'

80'

ROW

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Community Parkc o m m u n i t y p a t t e r n s 9

Detail plan of Community Park adjacent to Prairie Trail Town Center

The Community Park is located alongthe southeast edge of the Town Centeralong State Street. A major publicamenity, the park is part of a continuousopen space corridor. Approaching theTown Center from the south, the parkis the foreground public space and amajor address. The park features apavilion and amphitheater on a lakewith a series of restaurants incorporat-

ing outdoor dining terraces on the TownCenter side. The activities of the lakeare connected by a trail. The park isdesigned for major public events anddaily dining, boating and passive uses.The park is within easy walking distanceof both the Town Square and residentialareas. On-street parking along thesouthern edge of the park will also beprovided for visitors.

A perspective across the Community Park

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Prairie Trail Lot Typesc o m m u n i t y p a t t e r n s 10

Attached House Lots

c o m m u n i t y p a t t e r n s

Lot Typesprairie trail offers a varie ty of lot types and locations

throughout the different neighborhoods. These types include Townhouse,

Attached, Garden, Hamlet, Village, Estate, Manor, and Front-Loaded lots.

The average size of these lots and guidelines for placing houses on the lots are

described in the pages which follow. The lots are designed to accommodate a

range of house sizes and types within the community. Most of these lots have

rear lane accessed parking–either a garage, carport, or paved parking pad may

be constructed. Some lot types may be accessed directly from the street.

Attached house lots offer the opportunity to have multiple units designed in the

form of large houses.

Hamlet Lots

Garden Lots

Lot Type Plan for the Prairie Trail Community

Townhouse Lots

Village Lots

Front-Loaded Lots

Estate Lots

Manor Lots

Attached Lots 10 Units

Garden Lots 28 Units

Hamlet Lots 38 Units

Village Lots 112 Units

Estate Lots 40 Units

Manor Lots 18 Units

Total 246 Units

Lot Types–Setback Requirements

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c o m m u n i t y p a t t e r n s b 11

Setback RequirementsEach lot has a series of setback linesthat define a minimum yard betweenhouses, streets, and rear lanes. There arealso zones within which the house shallbe placed. The Front Facade shall beplaced within the Front Facade Zone

(described in the general conditionswhich follow for each lot type in theCommunity Patterns section). This zoneis set back from the front property lineat a distance defined by the Front Yard

Setback Line. The depth of the zone ismeasured from that line. The Front Yard

is the area between the Front YardSetback Line and the front propertyline. Porches may extend up to 8 feetinto the Front Facade Zone. Bay win-dows may also extend up to 2 feet intothe Front Facade Zone.

On corner lots, a Side Street Facade

Zone is established adjacent to the cross

street. It is set back from the side streeta certain dimension established in theCommunity Patterns for each neighbor-hood and is defined by the Side Street

Setback Line. The depth of the zone ismeasured from that line. The main body,side wings, garages, and fences areplaced within this zone. All facadeswithin this zone must follow the com-positional guidelines established by thearchitectural patterns. Houses on theselots shall have a continuous building,fence, or wall within the Side Street

Facade Zone.Side Yard Setback Lines define the

minimum distance between the structureand the side yard property line. A Rear

Yard Setback Line is established as aminimum setback for garages and sidewings.

Rear Lane Setback Line

Private Zone

Side Street Setback Zone

Side Street Facade Zone

Rear Yard Setback Zone

Side Yard Setback Line

Side Yard Setback Zone

Side Street Setback Line

Front Facade Zone

Front Yard Setback Line

Front Yard Setback Zone

A typical diagram explaining the locations of various lot setback requirements

Attached House Lots

Hamlet Lots

Garden Lots

Townhouse Lots

Village Lots

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Townhouse Lotsc o m m u n i t y p a t t e r n s 12

Character sketch of Townhouse Address

Rear Lane Setback Rear Lane Right-of-Way

Plan of Townhouse Zones and Setbacks Plan of building placement on the Townhouse Lots

Rear Property Line

Front Property Line

7'

5'

10

'


Private Zone

Front Facade Zone

Side Street Setback Zone

Lot Size

Townhouse lots are typically between 22to 30 feet wide by 90 to 100 feet deep.

Main Body

The main body of the Townhouse maymatch the width of the lot. (See lotmatrix for specific lot requirements.) Amaximum of 6 units may be attached.

Front Yard Setback/

Front Facade Zone

There is no minimum front setback.The front facade of the house may belocated anywhere within the 10-foot-deep Front Facade Zone. (See lot matrixfor specific lot requirements.)

Side Yard Setback

In cases where buildings are notattached, there is a minimum 5-foot set-back from the side street property line tothe house.

Side Street Setback/


Minimum 5-foot setback from the sidestreet property line to the house. Theside facade of a corner unit may belocated anywhere within the 5-foot-deepSide Street Facade Zone.

Alley Setback

Minimum 7-foot setback from the rearproperty line.

Side Wings

Side wings are not permitted onTownhouse lots.

Porch Encroachments

Porches may extend up to 8 feet into theFront Facade Zone. Bay windows mayalso extend up to 2 feet into the FrontFacade Zone. (Refer to setback require-ments on page B-11 for all permittedencroachments.)

Garage Requirements

Garages are set back either a minimumof 7 feet from the rear lane right-of-way

or 18 feet plus to create an outdoorparking pad. Garages may be eitherdetached or attached. Garage doorsopening onto public streets are not per-mitted.

Fencing Recommendations

Fences provide delineation betweenpublic and private space and are stronglyrecommended on corner lots. For morespecific fencing guidelines, see pageF-5 in the Landscape Patterns section.

Townhouse Lot Specifications

5'


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Attached House Lotsc o m m u n i t y p a t t e r n s 13

Attached House Lot Specifications

View of a Attached Houses on a court

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Plan of Attached House Zones and Setbacks Plan of house placement on the Attached House Lots

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Front Yard Setback

5' min

10' min

7'

10' 5'

15'

10

'

Side Street Setback


Rear Property Line

Front Property Line


Private Zone

Front Facade Zone


Side Yard Setback

Lot Size

Attached lots are typically 50 to 80 feetwide by 100 to 120 feet deep for duplexunits and 75 to 90 feet wide by 100 to120 feet deep for triplexes.

Main Body

The main body of the attached houseshall be a maximum width of 44 feetwide for duplexes and 62 feet wide fortriplexes.

Front Yard Setback/

Front Facade Zone

Typically houses have a minimum 10-foot setback from the front property lineto the house. The front facade of thehouse may be located anywhere withinthe 15-foot-deep Front Facade Zone.(See lot matrix for specific lot requirements.)

Side Yard Setback

Minimum 10-foot separation betweenbuildings.



Minimum 5-foot setback from the sidestreet property line to the house. Theside street facade may be located any-where within the adjacent 10-foot-deepSide Street Facade Zone.

Alley Setback


of-way or 18 feet plus to create an out-door parking pad. Garages may be eitherdetached or attached. Garage doorsopening onto public streets are not per-mitted.


Fences provide delineation betweenpublic and private space and are stronglyrecommended on corner lots andbetween houses. For more specific fenc-ing guidelines, see page F-5 in theLandscape Patterns Section.

Side Wings

Side wings are not permitted onAttached House lots.

Porch Encroachments

Porches may extend up to 8 feet into thefront yard. Bay windows may alsoextend up to 2 feet into the front yard.(Refer to overview of setback require-ments on page B-11 for all permittedencroachments.)

Garage Requirements

Garages shall be set back either a mini-mum of 7 feet from the rear lane right-

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c o m m u n i t y p a t t e r n s b 14

Garden Lots

Illustration of Garden Lots along a court

Plan of house placement on Garden Lots

18' p

lus7

'

10' 5'

10

'10

'

Plan of Garden Lot Zones and Setbacks

5' min

10' min

Front Yard Setback

Side Street Setback


Rear Property Line

Front Property Line


Private Zone

Front Facade Zone


Lot Size

Lots are typically 40 to 49 feet wide by100 to 120 feet deep.

Main Body

The main body of the house shall bebetween 24 and 32 feet wide within theFront Facade Zone.

Front Yard Setback/

Front Facade Zone

Typically houses have a minimum 10-foot setback from the front property lineto the house. The front facade of thehouse may be located anywhere withinthe adjacent 10-foot-deep Front FacadeZone. (See lot matrix for specific lotrequirements.)

Side Yard Setback

Side Yard Setbacks should total a mini-mum of 10 feet between buildings.




Alley Setback


Side Wings

1- to 1½-story side wings are encour-aged. These side wings shall be set backfrom the front facade of the main bodyby a distance equal to, or greater than,the width of the side wing.

doors opening onto public streets arenot permitted.


Fences provide delineation betweenpublic and private space and are stronglyrecommended on corner lots andbetween houses. For more specificfencing guidelines, see page F-5 in theLandscape Patterns section.

Porch Encroachments

Porches may extend up to 8 feet into thefront yard. Bay windows may extend upto 2 feet into the front yard. (Refer tosetback requirements on page B-11 forall permitted encroachments.)

Garage Requirements

Garages shall be set back either a mini-mum of 7 feet from the rear lane right-of-way or 18 feet plus to create anoutdoor parking pad. Garages may beeither detached or attached. Garage

Garden Lot Specifications

Side Yard Setback

Plan of Hamlet Lot Zones and Setbacks

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Hamlet Lotsc o m m u n i t y p a t t e r n s 15

Plan of house placement on Hamlet Lots

A sketch illustrating the character of Hamlet Lots

10' 5'

15'

10

'

18 ' p

lus

7' m

in

Front Yard Setback

Side Street Setback


Rear Property Line

Front Property Line


Private Zone

Front Facade Zone


Lot Size


Main Body

The main body of the house shall bebetween 28 and 36 feet wide within theFront Facade Zone.

Front Yard Setback/

Front Facade Zone


Side Yard Setback





Alley Setback


mum of 7 feet from the rear lane right-of-way or 18 feet plus to create an out-door parking pad. Garages may be eitherdetached or attached. Garage doorsopening onto public streets are not per-mitted.


Fences provide delineation betweenpublic and private space and are stronglyrecommended on corner lots andbetween houses. For more specific fenc-ing guidelines, see page F-5 in theLandscape Patterns section.

Side Wings

1- to 1½-story side wings are encour-aged. These side wings shall be set backfrom the front facade of the main bodyby a distance equal to, or greater than,the width of the side wing.

Porch Encroachments

Porches may extend up to 8 feet into thefront yard. Bay windows may alsoextend up to 2 feet into the front yard.(Refer to setback requirements on pageB-11 for all permitted encroachments.)

Garage Requirements

Garages shall be set back either a mini-

5' min

10' min

Hamlet Lot Specifications

Side Yard Setback

7'

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Village Lotsc o m m u n i t y p a t t e r n s 16

Sketch of Village Lot houses along a neighborhood street

Plan of Village Lot Zones and Setbacks Plan of house placement on Village Lots

10' 10'

10

'15'

18' p

lus 7' m

in

Lot Size


Main Body

The main body of the house shall be amaximum of 44 feet wide within theFront Facade Zone.

Front Yard Setback/

Front Facade Zone


Side Yard Setback





Alley Setback


Side Wings

1-to 1½-story side wings are encour-aged. These side wings shall be set backfrom the front facade of the main bodyby a distance equal to, or greater than,the width of the side wing.

Porch Encroachments


Garage Requirements

Garages shall be set back either a mini-mum of 7 feet from the rear lane right-of-way or 18 feet plus to create anoutdoor parking pad. Garages may beeither detached or attached.



Front Yard Setback

Side Street Setback


Rear Property Line

Front Property Line


Private Zone

Front Facade Zone


5' min

10' min

Village Lot Specifications

Side Yard Setback

7'

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Estate Lotsc o m m u n i t y p a t t e r n s 17

Sketch of Estate Lot houses along a neighborhood street

Plan of Estate Lot Zones and SetbacksPlan of house placement on Estate Lots

15' 10'

15'

25'

Lot Size

Lots are typically 80 to 110 feet wide by120 feet deep, but may be wider. Cornerlots should be a minimum of 90 feet by120 feet. Maximum lot coverage is 40%.

Main Body

The main body of the house within theFront Facade Zone shall be a maximumof 44 feet wide.

Front Yard Setback/

Front Facade Zone


Side Yard Setback


Rear Setback

Minimum 7-foot setback from the rearproperty line for detached garages andminimum 15 feet to any habitablestructure.

Side Wings

1-to 1½-story side wings are encour-aged. These side wings shall be set backfrom the front facade of the main bodyby a distance equal to, or greater than,the width of the side wing.

Encroachments


Garage Requirements

Garages may be either detached orattached. Garages opening onto publicstreets must be set back a minimum of18 feet from the front facade of themain body. Driveways within the frontyard shall be no wider than 10 feet.Minimum two-car garage required.Garage doors shall be no wider than 9for a single door and 16 feet for a dou-ble.

Street-loaded garages on corner lotsmust be designed as distinct pavilionslinked to the Main Body by single-storywings or detached. Garages must be

recessed a minimum of 5 feet behind theside facade of the house and a minimumof 18 feet from the edge of the sidewalk.

An accessory unit is permitted overthe garage; side drive accessed units maypark on street.



Front Yard Setback

Side Street Setback

Front Property Line

Private Zone

Front Facade Zone


5' min

10' min

Estate Lot Specifications

Side Yard Setback

15'

7'

Rear Yard Setback

Rear Setback to

Detached Garage

Rear Property Line

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Manor Lotsc o m m u n i t y p a t t e r n s 18

Sketch of Manor Lot houses along a neighborhood street

Plan of Manor Lot Zones and SetbacksPlan of house placement on Manor Lots

Lot Size

Lots are typically greater than 110 feetwide by 140 feet deep, but may be wider.Corner lots should be a minimum of130 feet by 140 feet. Maximum lot cov-erage is 40%.

Main Body

The face of the main body of the build-ing will be placed within the PrivateZone. Main body widths are a maxi-mum of 60 feet.

Front Yard Setback/

Front Facade Zone


Side Yard Setback


Rear Setback

Minimum 7-foot setback from the rearproperty line for detached garages andminimum 15 feet to any habitable struc-ture.

Side Wings

Single-story wings are encouraged. Theymay be used to increase maximum areacalculations by up to 15%.

Encroachments

Porches may extend up to 8 feet into thefront yard. Bay windows may alsoextend up to 2 feet into the front yard.(Refer to setback requirements on pageB-11 for all permitted encroachments).

Garage Requirements

Garages may be either detached orattached. Garages opening onto publicstreets must be set back a minimum of18 feet from the front facade of themain body. Driveways within the frontyard shall be no wider than 10 feet.Minimum two-car garage required.Garage doors shall be no wider than 9for a single door and 16 feet for a dou-ble.






Manor Lot Specifications

30'15'10'

30'

20'

Front Yard Setback

Side Street Setback

Front Property Line

Private Zone

Front Facade Zone


Side Yard Setback

15'

7'

Rear Yard Setback

Rear Setback to

Detached Garage

Rear Property Line

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Front-Loaded Lotsc o m m u n i t y p a t t e r n s 19

Sketch of Front-Loaded Lot houses along a neighborhood street

Plan of Front-Loaded Lot Zones and Setbacks

Side Yard Setback


Rear Setback

Minimum 7-foot setback from the rearproperty line for detached garages andminimum 15 feet to any habitable struc-ture.

Side Wings

Single-story wings are encouraged. Theymay be used to increase maximum areacalculations by up to 15%.

Encroachments

Porches may extend up to 8 feet into thefront yard. Bay windows may alsoextend up to 2 feet into the front yard.(Refer to overview of setback require-ments for all encroachments on pageB-11).

Garage Requirements

Garages may be either detached orattached. Garages opening onto publicstreets must be set back a minimum of18 feet from the front facade of themain body. Driveways within the frontyard shall be no wider than 10 feet.Minimum two-car garage required.Garage doors shall be no wider than9 feet.






Front-Loaded Lot Specifications

Plan showing placement of typical front-loaded houses on lots

Lot Size

Front-loaded lots are typically 60+ feetwide by 120 feet deep. Corner lotsshould be a minimum of 70 feet by 120feet. Maximum lot coverage is 40%.

Main Body

The face of the main body of the build-ing will be placed within the FrontFacade Zone. The main body width is40 feet for lots less than 80 feet in widthand 44 feet for lots greater than 80 feetin width.

Front Yard Setback/

Front Facade Zone

Houses have a 25-foot setback from thefront property line to the house. Thefront facade of the building may belocated anywhere within the adjacent15-foot-deep Front Facade Zone. (Seelot matrix for specific lot requirements.)

15'

10'15'

7'

5'

15'

25'

Front Yard Setback

Side Street Setback

Rear Yard Setback

Private Zone

Front Facade Zone


Rear Setback to

Detached Garage

Side Yard Setback

Rear Property Line

community patterns b section - prairie trailcommunity patterns 10 attached house lots lot types...

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