Dana Bull is a real estate agent, investor, and consultant.Courtesy of Dana BullDana Bull has invested in long-term rentals throughout her entire career. She's experimenting with a mid-term rental in 2025 to combat high interest rates.Generally, mid-term rentals offer higher revenue but require more management than long-term leases.Dana Bull started building her real-estate portfolio in 2012 when she bought her first property.Over the next decade, she expanded to more than 20 units in her Massachusetts market and hit financial independence by sticking to the same general strategy: buying quality properties with upside and filling them with long-term tenants.Bull, who is also a real-estate agent and consultant, told Business Insider that she "swore off investing a couple of years ago." Managing properties is time-intensive, noted the mother of four.But when a charming single-family in Marblehead came on the market in the fall of 2023, she broke her promise."This little place in my town caught my eye, and I really wanted somebody else to buy it," said Bull.