C2 districts are mapped as commercial overlays within residence districts. They are mapped along streets that serve the local retail needs of the surrounding residential neighborhood.

Typical retail uses include grocery stores, restaurants and beauty parlors, catering to the immediate neighborhood. C2 districts permit a slightly wider range of uses than in C1, such as funeral homes and repair services. In mixed residential/commercial buildings, commercial uses are limited to one or two floors and must always be located below the residential use.

C2-3 is a commercial overlay district with a depth of 150 feet. These districts are largely found in throughout the city's lower and medium-density districts.

Overlay districts are distinct from other commercial districts in that residential bulk is governed by the residence district within which the overlay is mapped. All other commercial districts that permit residential use are assigned a specific residential district equivalent.

When residences are constructed in any commercial district, certain regulations that apply in residence districts are waived, such as front and side yard requirements.

C2-3 overlays mapped in R1 through R5 districts have a maximum commercial FAR of 1.0. When mapped in R6 through R10 districts, however, the maximum commercial FAR is 2.0.

Commercial parking requirements are highly complex, reflecting traffic-generating qualities of the various commercial uses, their size and proximity to mass transit. Generally, the lower the numerical suffix, the more off-street parking is required in a particular district.

R4A districts permit only one- and two-family detached residences. Characterized by houses with two stories and an attic beneath a pitched roof, R4A districts have a FAR of up to 0.75 (plus an attic allowance) and a minimum lot width of 30 feet. The districts are usually mapped in older neighborhoods.

The perimeter wall of a house in an R4A district may rise to 21 feet before sloping or being set back to the maximum building height of 35 feet. The amount of required open space in R4A districts is governed by yard requirements: a front yard at least 10 feet deep and at least as deep as an adjacent front yard up to a depth of 20 feet; a 30-foot-deep rear yard; and two side yards that total at least 10 feet and a minimum width of two feet each.

One off-street parking space is required for each dwelling unit. Parking must be located in a driveway along a side lot ribbon if the lot is less than 35 feet wide. If the lot is 35 feet or wider, a garage is permitted within the house, provided the driveway is at least 18 feet deep.

R5D districts, designed to encourage new development on major streets in autodependent areas of the city. Characterized by moderate-density, multi-family housing, R5D districts require a maximum floor area ratio (FAR) of 2.0, a height limitation of 40 feet and a significant amount of accessory parking.

The minimum lot width for single- and two-family detached houses is 25 feet; side yards are not required on lots less than 30 feet wide. As in R4B and R5B districts, the front yard must be at least 5 feet deep and it must be at least as deep as one adjacent front yard but no deeper than the other, to a maximum depth of 20 feet. Rear yards are required for all interior and through lots. Certain amenities of the Quality Housing Program are mandatory, including plantings betweenthe building and the front lot line and one street tree for every 25 feet of lot frontage. Off-street parking, which is not permitted in front of a building, is required for 66% of all dwelling units. Only one parking space may be waived.