Broker Luis Fonseca is marketing his third property at a townhouse community in Opa-locka. He’s flipped two other units for investors in the complex, and now Fonseca has the listing for a three-bedroom, two-bathroom, 1,250-square-foot home priced at $97,000.

Fonseca is one of dozens of brokers handling sales for flippers—investors scooping up residential property, making quick upgrades and selling within months for a profit—in the largely working-class community in northwestern Miami-Dade County.