Starwood Capital Group, Greystar and Invitation Homes Inc. are among those investing in the firm’s new $165 million fund. : (Bloomberg)—A group of landlords including Starwood Capital Group, Greystar, Cortland and real estate investment trusts such as Invitation Homes Inc. and Mid-America Apartment Communities Inc. have backed RET Ventures to make early-stage bets on property-technology startups. The Park City, Utah-based firm has raised a new $165 million fund and -- unlike many venture groups -- has no pension funds or endowments among its investors.