Host Compliance, which gathers data on short-term rentals in more than 100 U.S. cities, found a 250 percent year-over-year spike in complaints this summer.

Opendoor Labs Inc. is planning to go public by merging with a special-purpose acquisition company.

Some buyers that want to keep properties affordable are hoping to snap up assets that otherwise might be converted to market rate units if they fall into other investors' hands.