In a recent Bloomberg column, Associate Professor of Urban Planning Michael Manville weighed in on SB9, a new California law that allows people who own single-family homes to add additional units on their property by constructing a new building or turning an existing house into a duplex. SB9 creates opportunities to make land more valuable in areas where housing is in great demand by allowing small-scale projects and giving homeowners a financial stake in new housing. Manville said that many of those who oppose SB9 don’t want to see their neighborhoods change, in spite of the financial advantages of the new law. “They like their neighborhood, they are risk averse, and they don’t want to see it change,” he said. However, Manville also noted that many historic L.A. neighborhoods include attractive duplexes and fourplexes from the early 20th century. “If more of the city just looked like that, we probably wouldn’t have a housing crisis,” he said.