3.2002.1958: Housing, Industrial: United States. New York. Brooklyn: Two-Family Houses. Brick Construction: Group of duplex - Two family houses - Mann & MacNeille, Architects. Brooklyn, N.Y.: Five groups of these houses were built in Brooklyn, New York. They vary somewhat in size and cost, but a typical plan has 7 rooms and baths and servants' toilet. Typical group, cost per apartment: land and grounds, $1,250; building, $3,750; total $5000. Rent, $50 per month. Gross return, 14 1/25. Net return on equity 85. The demand for the upper apartments proved to be as great as for the lower ones. The upper apartments used the flat portion of the roof for a yard while the families in the lower apartments used the rear yard.