Indeed. At first I thought the gray areas of the map were inactive or had no data available. But upon clicking, the pop-up legend says that gray means "One-Fam

Indeed. At first I thought the gray areas of the map were inactive or had no data available. But upon clicking, the pop-up legend says that gray means "One-Family Dwelling", and "Zoning District" is RS-1, RS-3, RS-5, RS-6, etc.