"I knew about Los Angeles City Hall," says Pactriglo's founder Benjamin Pezzillo. "I knew the bottleneck to more housing was in the bureaucracy of taking a specific property and getting it entitled or its zoning changed."

But it was on his return from a trip to China when the lightbulb clicked.

"As I looked at Los Angeles from the plane," says Pezzillo. "It hit me that there had to be a way to calculate zoning utilization and thus identify underutilized, existing zoning. So I decided to build it."