The R1-6 zoning district in Glendale, Arizona is a residential zone that's typically used for single-family homes, but may allow duplex conversions under certain conditions. Lot size: A minimum lot size of 6,000 square feet. Lot width: A minimum width of 55 feet. Dwelling units: A maximum of one dwelling unit per lot. Lot coverage: A maximum lot coverage of 30% of the lot area.