For uses denoted with a “S” in Section 22-131 (Use Group III – general use allowances), the following provisions shall apply:

1. For any philanthropic or non-profit institutions, with or without sleeping accommodations, in all Residence Districts, the number of persons employed in central office functions shall not exceed 50, and the amount of floor area used for such purposes shall not exceed 25 percent of the total floor area, or, in R8, R9 or R10 Districts, 25,000 square feet, whichever is greater.
2. Ambulatory diagnostic or treatment health care facilities in R3-1, R3A, R3X, R4-1, R4A or R4B Districts shall be limited to a maximum of 1,500 square feet of floor area. However, in R3-1, R3A, R3X, R4-1 or R4A Districts in lower density growth management areas, ambulatory diagnostic or treatment health care facilities shall be limited, on any zoning lot, to 1,500 square feet of floor area, including cellar space, except that where a zoning lot contains a hospital, as defined in the New York State Hospital Code, or a long-term care facility, such 1,500 square feet restriction shall not include cellar space.

In such Residence Districts, excluding lower density growth management areas, ambulatory diagnostic or treatment health care facilities may be permitted up to 10,000 square feet of floor area by special permit of the Board of Standards and Appeals, in accordance with Section 73-134 (Ambulatory diagnostic or treatment health care facilities).