23-14 Open Space and Floor Area Regulations in R1 through R5 Districts

R1 R2 R3 R4 R5

In the districts indicated for any #zoning lot#, the minimum required #open space# or #open space ratio# shall not be less than set forth in this Section, and the maximum #lot coverage# shall not exceed the #lot coverage# as set forth in this Section. Any given #lot area# or area of #open space# shall be counted only once in determining the #floor area ratio#, the amount of #open space# or the #open space ratio#.

In R1 and R2 Districts without a letter suffix, the #floor area# and #open space# provisions of Section 23-141 shall apply. In R1 and R2 Districts with a letter suffix, and R3, R4 and R5 Districts, the provisions of Section 23-142 shall apply.

In R4 and R5 Districts without a letter suffix, the provisions of Section 23-143 shall apply to #buildings# utilizing the optional provisions for a #predominantly built-up area#. In R3-2, R4 and R5 Districts without a letter suffix, the provisions of Section 23-144 shall apply to #affordable independent residences for seniors#.

For #zoning lots# with #buildings# containing multiple #uses# or multiple #buildings# with different #uses#, the maximum #floor area ratio# for each #use# shall be as set forth in the applicable provisions of this Section, inclusive, or Section 24-10 (FLOOR AREA AND LOT COVERAGE REGULATIONS), inclusive, provided the total of all such #floor area ratios# does not exceed the greatest #floor area ratio# permitted for any such #use# on the #zoning lot#. However, for #zoning lots# providing #affordable independent residences for seniors# and other #residential uses#, the sum of all #floor area# allocated to #uses# other than #affordable independent residences for seniors# on the #zoning lot# shall not exceed the maximum #floor area ratio# permitted for #residential uses# set forth in Sections 23-142 or 23-143, as applicable.

Where #floor area# in a #building# is shared by multiple #uses#, the #floor area# for such shared portion shall be attributed to each #use# proportionately, based on the percentage each #use# occupies of the total #floor area# of the #zoning lot#, less any shared #floor area#.

In addition to complying with the provisions of this Section, all #zoning lots# shall be subject to the provisions set forth in Section 23-22 (Maximum Number of Dwelling Units) as well as all other applicable #bulk# regulations as set forth in this Chapter.

R1 R2

In the districts indicated, except R1-2A, R2A and R2X Districts, the minimum required #open space ratio# shall be 150.0, and the maximum #floor area ratio# shall be 0.50.

R1 R2 R3 R4 R5

In R1 and R2 Districts with a letter suffix and R3 through R5 Districts, the maximum #lot coverage#, minimum #open space# and maximum #floor area ratio# shall be as set forth in the following table:

District	Maximum #Lot Coverage# (in percent)	Minimum Required #Open Space# (in percent)	Maximum #Floor Area Ratio#
R1-2A	30	70	.50
R2A	30	70	.50
R2X	N/A governed by	#yard# requirements	.85
R3-1 R3-2	35	65	.50
R3A R3X	N/A governed by	#yard# requirements	.50
R4	45	55	.75
R4-1 R4A	N/A governed by	#yard# requirements	.75
R4B	55	45	.90
R5	55	45	1.25
R5A	N/A governed by	#yard# requirements	1.10
R5B	55	45	1.35
R5D	60*	40*	2.00

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In addition, the following rules shall apply:

1. In R2X, R3, R4, R4A and R4-1 Districts, except R3, R4A and R4-1 Districts within #lower density growth management areas#, the #floor area ratio# in the table in this Section may be increased by up to 20 percent provided that any such increase in #floor area# is located directly under a sloping roof which rises at least three and one half inches in vertical distance for each foot of horizontal distance and the structural headroom of such #floor area# is between five and eight feet.


2. In R3, R4-1 and R4A Districts in #lower density growth management areas#, the #floor area ratio# in the table in this Section may be increased by up to 20 percent provided that any such increase in #floor area# is located in any portion of a #building# covered by a sloping roof that rises at least seven inches in vertical distance for each foot of horizontal distance.


3. In R3, R4 and R5 Districts, the permitted #floor area# of a #single-# or #two-family detached# or #semi-detached residence developed# after June 30, 1989, may be increased by up to 300 square feet if at least one enclosed #accessory# off-street parking space is provided in a garage located, wholly or partly, in the #side lot ribbon# pursuant to Sections 23-12 (Permitted Obstructions in Open Space), paragraph (e), 23-441 (Location of garages in side yards of corner lots) or 23-442 (Location of garages in side yards of other zoning lots).


4. In R1-2A Districts and in R3, R4-1 and R4A Districts within #lower density growth management areas#, the permitted #floor area# of a #single-# or #two-family detached# or #semi-detached residence# may be increased by up to 300 square feet for one parking space and up to 500 square feet for two parking spaces provided such spaces are in a garage located, wholly or partly, in the #side lot ribbon# pursuant to Sections 23-12, paragraph (e), 23-441 or 23-442, except that in R1-2A Districts, such parking spaces need not be located in the #side lot ribbon#.


5. In R2A Districts, the permitted #floor area# may be increased by up to 300 square feet for a detached garage located in a #rear yard#, except where a parking space is provided within a #building# containing #residences#.


6. In R3 Districts, except for #zoning lots# containing #single-#, #two-#, or three-#family residences#, 50 percent of the required #open space# on a #zoning lot#, except such #open space# in a #front yard#, shall have a minimum dimension of 12 feet and shall not be used for driveways, private streets, open or enclosed #accessory# off-street parking spaces or open or enclosed #accessory# off-street loading berths.


7. In R4 and R5 Districts, except for #zoning lots# containing #single-#, #two-# or three-#family residences#, 33 percent of the required #open space# on a #zoning lot#, except such #open space# in a #front yard# or, in R5D Districts, the open area between the #street line# and #street wall# of a #building# or its prolongation, shall have a minimum dimension of 12 feet and shall not be used for driveways, private streets, open or enclosed #accessory# off-street parking spaces, or open or enclosed #accessory# off-street loading berths.

R4 R5

In the districts indicated without a letter suffix, the maximum #floor area ratio# and #lot coverage# and the minimum required #open space# for any #zoning lot# utilizing the special optional regulations of a #predominantly built-up area# are set forth in the following table:

District	Maximum #Lot Coverage# (in percent)	Minimum Required #Open Space# (in percent)	Maximum #Floor Area Ratio#
R4 R5	55 55	45 45	1.35 1.65

R3-2 R4 R5

In the districts indicated, except R4-1, R4A, R4B, R5A, R5B and R5D Districts, the maximum #lot coverage# and maximum #floor area ratio# for #affordable independent residences for seniors# shall be as set forth in the following table.

In R5D Districts, the #open space# and #floor area# regulations set forth in Section 23-142 (Open space and floor area regulations in R1 and R2 Districts with a letter suffix and R3 through R5 Districts) shall apply to #affordable independent residences for seniors#.

MAXIMUM FLOOR AREA RATIO FOR AFFORDABLE INDEPENDENT RESIDENCES FOR SENIORS IN R3-2, R4 AND R5 DISTRICTS
District	Maximum #Lot Coverage# (in percent)	Maximum #Floor Area Ratio#
R3-2 R4 R5	35 45 55	0.95 1.29 1.95