An Atlanta-based multi-family real estate specialist has purchased a $154 million portfolio of properties in a deal that makes it one of the largest private apartment owners in the metro area.

Cortland Partners announced Tuesday the move to buy properties in Dallas, Houston and Jacksonville, which will increase the firm’s real estate holdings by 20 percent.

The firm’s chief executive, Steven DeFrancis, said the deal marks the firm’s first foray into Florida and will triple its presence in Texas. Cortland Partners now has more than 10,000 units across the region.