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BOSTON-The Boston Redevelopment Authority has approved two projects that will bring nearly 600 residential units to South Boston and Allston.

The larger of the projects will be built at 371-401 D St. in South Boston where locally based Intercontinental Real Estate Corp. will build 585 units, 76 of which will be affordable, on three parcels of land totaling approximately 243,195 sf. The two-phase project will create four new buildings totaling 690,000 sf with construction expected to begin in the spring of 2007. Phase 1 of the project, which encompasses 377 units, should be completed in 18 months.

In Allston, 100 new units will replace five existing one-story garage buildings on a 36,377-sf site in a largely residential neighborhood. Developed by Leggat McCall Properties, of Boston, and the Legend Group, the $40-million project will consist of a six-story building that will contain that will 39 one-bedroom and 61 two-bedroom units, eight of which will be affordable. Construction on that complex should be completed within 16 to18 months.