BETHESDA, MD. — Bethesda-based Green Park Financial has added $102.89 million to an existing credit facility for Milestone Multifamily Investors that was first completed in 2005. The loan addition is derived from cross-defaulted and cross-collateralized mortgages and is secured by multifamily properties in Arizona, Florida and Texas. The eight Class B properties encompass 3,000 units. The current 5-year loans carry the option for a 5-year extension.