Though they're grappling with possible changes that could affect the way they're run, HDFCs—aka affordable co-ops offered through the Housing Development Fund Corporation program, hence the acronym—remain one of the best ways to own property in this increasingly expensive city for low- to middle-income earners. (To learn more about them, read our primer.)

This weekend, a handful of them are hosting open houses for those on the hunt. Here's what you'll find:

307 West 153rd Street, Apartment 4-19. No interior pics are available, so you'll have to see for yourself what the space is like in this 650-square-foot two-bedroom, one-bath. Cash only. Asking price: $160,000. Open house: Sunday, January 15, 3 pm to 4:30 pm.

342 East 100th Street, Apartment 2B. This East Harlem two-bedroom has new floors and new appliances, and gets tons of light. Asking price: $400,000. Open house: Saturday, January 14, 1 pm to 2 pm.

79 Hamilton Place, Apartment 25. This renovated apartment in an HDFC prewar has new floors and new countertops, and sits across Alexander Hamilton Park. Asking price: $439,000. Open house: Saturday, January 14, 12 noon to 2 pm.