In R3-1, R3A, R3X, R4-1, R4A or R4B Districts, the Board of Standards and Appeals may permit ambulatory diagnostic or treatment health care facilities listed under Use Group III(B), limited in each case to a maximum of 10,000 square feet of floor area, provided that the Board finds that:

1. outside of lower density growth management areas, the amount of open area and its distribution on the zoning lot conform to standards appropriate to the character of the neighborhood; or
2. in lower density growth management areas, such facilities are located on zoning lots that comply with the minimum lot area and lot width regulations of Section 23-35 (Special Provisions for Zoning Lots Containing Certain Community Facility Uses in Lower Density Growth Management Areas). 

The Board may prescribe appropriate conditions and safeguards to minimize adverse effects on the character of the surrounding area.