Proposition C on San Francisco's June ballot would require that 25 percent of units in new large and medium-sized residential buildings be offered at below market rates. If passed, the measure would make San Francisco the city with the most stringent affordable housing mandate in the nation. But some housing advocates say that with the high cost of construction and real estate prices, the measure could deter investors and actually stymy housing growth.

Guests:

Stephanie Martin Taylor, KQED anchor and housing reporter

Jane Kim, San Francisco Supervisor for District 6

Sonja Trauss, founder of the San Francisco Bay Area Renter's Federation.