ARTICLE II RESIDENTIAL DISTRICTS
30.21 R-1 Districts (one-family residential)

In R-1 Districts, no building or premises shall be used, and no building shall be erected or altered, for other than a single-family detached dwelling and accessory structures and uses as provided in Article VII of this Chapter.

30.22 R-2 Districts (one-family residential)

In R-2 Districts no building or premises shall be used, and no building shall be erected or altered for other than one (1) or more of the following uses:

Any use permitted in R-1 Districts.

30.23 R-3 Districts (two-family residential)

A. Permitted uses.

In R-3 Districts no building or premises shall be used, and no building shall be erected or altered for other than one (1) or more of the following uses:

1. Any use permitted in R-2 Districts.

2. Two-family detached dwellings.

30.24 R-4 Districts (garden-type apartments, residential)

A. Permitted uses.

In R-4 Districts, no building or premises shall be used and no building shall be erected or altered, for other than one (1) of the following uses:

1. Any use permitted in R-3 District.

2. A group of multi-family dwellings in a single lot subject to the following conditions:

a. Buildings shall be so grouped that each building shall face for the full length of its front facade either upon an existing street, or upon an open space which in its least dimensions shall not be less than seventy-five (75) feet.

Where the rear elevations of the principal buildings are built parallel to each other or within thirty degrees (30) of parallel, the average distance between their long dimension shall be not less than sixty (60) feet. Each building, whether principal or accessory, shall be at least thirty (30) feet distant from any other building in the group, which distance shall be measured in a straight line between the points of the buildings which are nearest each other.

b. No basement, garage or cellar shall be occupied as living or sleeping quarters.

30.25 R-5 district (apartment residential)

A. Permitted uses.

In R-5 Districts, no building or premises shall be used, and no building shall be erected or altered, for other than one (1) or more of the following uses:

1. Any use permitted in R-3 Districts.

2. A group of attached one-family or two-family dwellings with party walls, provided it includes not more than six (6) family units.

3. Multiple dwellings relative to which the maximum density shall be fifteen (15) units per acre.