BALTIMORE — A mortgage product marketed as a fast, streamlined way to finance rental properties has become entangled in a foreclosure crisis spreading through some of Baltimore’s most distressed neighborhoods. The loans, known as debt-service-coverage-ratio, or DSCR, loans, are designed for real-estate investors. Rather than placing primary emphasis on a borrower’s paycheck, the financing is tied largely to whether a property’s expected rental income can cover its debt payments. In recent years, Wall Street has directed billions of dollars into the market, helping investors buy properties quickly and in large numbers. In Baltimore, that easy money helped two local landlords assemble what may be one of the city’s largest privately held real-estate portfolios. The pair acquired more than 700 homes and borrowed roughly $100 million, according to reporting examined in a Planet Money episode released Sept. 11, 2026. The strategy promised to bring capital into neighborhoods filled with vacant and abandoned rowhouses. Instead, many properties became part of a widening foreclosure wave after the investors attempted to disappear, leaving lenders and communities to deal with the fallout. The episode’s findings raise a basic question for investors, lenders and regulators: Are DSCR loans a useful private-market tool for financing housing, or are they another example of financial engineering outrunning common sense? Baltimore’s experience is particularly significant because the city has long struggled with vacant housing, blight and the cost of enforcing property standards. When highly leveraged owners fail, the damage does not stop with banks and private lenders. Empty homes can drag down surrounding property values, invite crime and shift cleanup and enforcement costs onto taxpayers. The fallout has also drawn scrutiny beyond the foreclosure proceedings. Related investigations have examined alleged housing discrimination, repeated resales of Baltimore properties, questionable property records and the conduct of New York-based investors tied to the foreclosure wave. The FBI is investigating the investors, while Baltimore officials are examining possible fair-housing violations. The Baltimore case is now serving as a warning for other cities. DSCR lending is expanding beyond Maryland into industrial and lower-cost housing markets nationwide, where investors can purchase large portfolios with less traditional underwriting and less reliance on personal income documentation. Supporters of the loans argue that private capital can move faster than government housing programs and can finance repairs or purchases that conventional banks may avoid. But the Baltimore collapse shows the danger when rapid expansion, high leverage and weak oversight converge. A financing product that looks efficient on a spreadsheet can leave neighborhoods with boarded-up houses and unpaid bills when the promised rental income never materializes.