Developer Strada Investment Group LLC has secured $100 million in funding for a massive six-building project near Mid-Market and Hayes Valley.

Straddling 2 acres and nearly the full block at 12th and Market Streets, the site will include about 480 market-rate rental units and 100 affordable units, a new hall for UA Local 38 Plumbers & Pipefitters and a gut renovation of the Civic Center hotel — plus 23,000 square feet of open space to boot. The project is unusual in its mix of supportive affordable housing for formerly homeless individuals and market-rate homes.