iron on solid sheathing of not less than thirteen-sixteenths inch boards, and shall be drained.

SECTION 17.-(m) DISTANCE BETWEEN BUILDINGS ON ONE LOT.-Where an apartment house or hotel is now or hereafter erected upon a lot other than a corner lot no other structure of any character or kind for any use shall hereafter be placed on the front or the rear of such lot unless the minimum distance between such buildings shall be at least twenty feet, and two additional feet shall be added to such minimum distance of twenty feet for every story more than two in height of the highest building on such lot; provided, however, that the provisions of this section shall not apply to dwellings; provided, further, that a building not more than one story in height to be used as a garage for the sole use of the occupants of the apartment house erected on the same lot, may be erected in the rear of an apartment house less than twenty feet distant from the apartment house, provided said garage building does not encroach upon or occupy any portion of the lot required to be used or left vacant for use as a rear yard.

SECTION 18.-(n) MEASURING DEPTH OF REAR YARD OF HOTEL OR APARTMENT HOUSE.-The depth of a rear yard for an apartment house or hotel shall be measured at right angles from the extreme rear line of the building towards the rear lot line.

SECTION 19.-(0) EXCAVATED FRONT YARD.-Every front yard which is excavated below the level of the curb or below the adjoining ground level for the purpose of furnishing light and ventilation to a basement shall in no part be less in width and length than required for outer courts.

SECTION 20.-(p) SIDE YARD.-The width of every side yard shall be not less than the width required for an outer court and measured in the same manner as an outer court, except that the provisions of this act regarding the maximum lengths of an outer court shall not ap

ply to a side yard; provided, that if there is a side yard on both sides of the building, connected one with the other across the rear of the building by a rear yard, then the width of each such side yard may be reduced twelve inches.

SECTION 21.-(q) OUTER COURTS OF APARTMENT HOUSES. The outer courts of all apartment houses hereafter erected shall have not less than the following minimum widths nor more than the following maximum lengths as set out in the following table:

Provided, however, there shall be added to the minimum width of each such outer court six inches for each five feet or fractional part thereof in excess of the maximum length, except in the case of outer courts in apartment houses not more than two stories in height. The maximum lengths herein provided shall not apply when the outer court is bounded on one side for its entire length by a lot line; provided, however, that if an outer court is bounded by a public alley or public park, the width of such public alley or public park may be considered a part of the lot in determining the required width of the outer court.

(r) OUTER COURTS OF HOTELS.-The outer courts of all hotels hereafter erected shall have not less than the following minimum widths as set out in the following table:

Height of building in stories based on the full number of stories in the building measured upwards from and including the lowest story in which there is a guest room or guest rooms, or dormitory or dormitories.

1 and 2 stories

3 stories

4 stories

5 stories

6 stories

7 stories or more....

Minimum width of outer court in every part

4 feet 0 inches 4 feet 6 inches

5 feet 0 inches

6 feet 0 inches

7 feet 0 inches

8 feet 0 inches

Outer courts for dwellings shall be governed in the same manner and be of the same minimum widths herein provided for apartment houses of two stories in height.

SECTION 22.-In no event shall any yard or court be made to serve two buildings hereafter erected, or an existing building and a building hereafter erected.

SECTION 23.-(s) INNER COURTS OF APARTMENT HOUSES.—The inner courts of all apartment houses hereafter erected shall have minimum areas and minimum widths in all parts not less than the areas and widths contained in the following table:

Provided, however, in apartment houses the mini

mum size of inner courts bounded on one side for their

entire length by a lot line shall be not less than of the minimum areas and minimum widths contained in the following table:

Any inner court, including inner courts one entire side of which is bounded by a lot line, for an apartment house hereafter erected, designed and built to accommodate not more than two families above the first story thereof, may be reduced one foot in its width from the widths herein before prescribed, and every such inner court shall contain an area of not less than sixty square feet.

Every inner court and vent shaft in apartment houses hereafter erected and every inner court in any apartment house or hotel shall be provided with a door or window at or near the bottom thereof, giving sufficient access to such court or vent shaft as to enable it to be properly cleaned out. Inner courts for dwellings shall be not less in width and area than hereinbefore provided for outer courts and shall contain an area of not less. than sixty square feet.

SECTION 24.-(t) INNER COURTS OF HOTELS.—The inner courts of all hotels hereafter erected shall have not less than the following minimum lengths nor less than

the minimum widths in every part as set out in the following table:

courts

Provided, however, in hotels the inner bounded on one side for their entire length by a lot line shall have not less than the following minimum lengths nor less than the minimum widths in every part as set out in the following table:

The minimum width of an inner court bounded by a lot line, as set forth in the foregoing table shall always be measured at right angles to the lot line and the minimum length of such a court shall always be measured parallel to the lot line.

SECTION 25.-(u) RECESSES AND INTAKES.-Every recess from a court, yard or street in an apartment house