Thompson Builders Corporation (TBC) has officially broken ground on 300 De Haro Street, a $107 million affordable housing development that will deliver 425 new homes in San Francisco. Spanning 180,880 square feet, the 11-story complex is the largest residential project to break ground in the city in both 2024 and 2025 — a milestone that underscores the scale and urgency of San Francisco’s affordable housing efforts.