Perfect Investment Property. RM-2.5 Zoned allows Multi-Family Development. The RM-2.5 district is intended to serve general plan land use classifications of medium density and high density, and particularly within older single-family districts where vacant property has been bypassed because of excessive size, irregular shape, or difficulty in providing public access. Minimum 2500 square foot is in reference to multi-family development per unit. To build a 10 unit apartment you must have 25,000 square foot lot. The current use is a residential home so the 2500 does not apply unless the new owners want to develop multi-family.