800 Grand Ave Condos

The Los Angeles County Assessor's 2026 roll records 54 condominium units at 800 Grand Ave, Diamond Bar 91765. That makes it the 2nd-largest of the 5 condo buildings with 20 or more units in Diamond Bar.

The Assessor records a year built of 1992 for the condominium units at 800 Grand Ave. That is the building's construction year, not when the units were last sold or renovated.

Living area on the Assessor's roll runs from 814 to 1,047 square feet (median 828). By bedrooms: 54 two-bedroom.

The Assessor's roll doesn't name the homeowners association. California associations file a statement with the Secretary of State listing their address and management contact; search the California Secretary of State's business search for the association's name, or ask the building's front desk or a unit owner for the current property manager. LA Condo HQ is an independent research site, not the association.

The association or its management company — not LA Condo HQ. We are an independent research website with no access to any association's records, so we can't complete condo questionnaires, issue estoppel certificates or supply master insurance policies. Ask the unit owner or the building for the current property manager, or look up the association's registered agent and principal address in the California Secretary of State's business search.

California's SB 326 requires condominium associations to have elevated wood-framed elements such as balconies and walkways inspected on a set schedule. The Assessor's roll does not show whether 800 Grand Ave has completed one. Ask the association for its latest inspection report and reserve study before you buy.