A joint venture will bring an 18-story, $150 million mixed-used development to downtown Rockville. Duball LLC, Daiwa House Group and the Housing Opportunities Commission of Montgomery County announced Friday the purchase of 1.5 acres at the corner of Middle Lane and Monroe Street. The development will have 250 market-rate multifamily units, 150 senior affordable residential units, 19,000 square feet of ground-level retail and more than 600 parking spaces. Buffalo, New York-based M&T Bank is...