"We recently entered an agreement with one of our long-standing third-party relationships to build homes that will be purchased by that third-party in a stand-alone rental community," Lennar President Rick Beckwitt said on the company's earnings call. "This community is in Florida and is the first in what we believe will be an ongoing business strategy and relationship where we build and sell homes in bulk on land owned by third parties with no lease-up risk."
In 2017, 37,000 homes were built as rentals, according to the National Association of Home Builders. That grew to 43,000 last year, or just under 5% of total single-family housing starts. But that is just homes built and held by builders for rent and doesn't include those sold directly to investors, so the numbers are likely larger and growing more quickly.