That’s dramatically revamped the universe of listings, erasing more than half, tilting the market even more toward Airbnb, easing enforcement of local laws, and returning some rental units to a city that desperately needs them. “The regulations had a massive impact on the number of rentals in the city, with an overall 55 percent reduction,” said Ulrik Binzer, Host Compliance CEO and founder. Airbnb saw the smallest percentage loss. Both HomeAway and FlipKey showcase many second homes, which cannot qualify as vacation rentals here because the owners are not permanent residents. Neither of those two sites list private rooms or shared rooms, which remain staples on Airbnb. Get the full story at the San Francisco Chronicle