Michael Manville, associate professor of urban planning, spoke to Architectural Digest about Apple’s announcement that it would invest $2.5 billion to address California’s housing crisis. The plan includes converting a 40-acre plot of land the company owns in San Jose into space for affordable housing. Manville said much of San Jose is reserved for detached single-family homes, “making for very inefficient use of valuable land.” Residents may be hesitant to change zoning rules because they like how their neighborhood looks or the fact that their house has tripled in value, Manville said. But he urged, “We must build up, so that the same plot of land of one home can accommodate many families. You know, the elevator also exists in Silicon Valley.” The alternative, he said, is a place that has the economy of a megacity and built environment of a suburb, “and that’s simply not sustainable.” Manville concluded, “Land is finite, but housing is not.”