D.C. residents who lived in certain federally subsidized housing projects four years ago have until Feb. 15 to apply for an average of $500 in rent refunds. The deadline has been extended because so few people who are eligible for the nationwide refund have applied.

Persons who lived in HUD Section 236 housing between Feb. 1, 1975, and Sept. 30, 1977, may be eligible for the refunds. More than 5,700 D.C. residents who paid illegal rent increases are owed refunds.

The refunds are part of a $60 million settlement between the Housing and Urban Development Department and a legal services lawyer who filed a class action suit in 1975.

Claim forms can be obtained from Section 236 project managers or by calling, toll free, 800-824-7980.

Persons who lived in the following projects in D.C. between Feb. 1, 1975 and Sept. 30, 1977, may be eligible:

Azeeze Bates Court, Benning Road Apartments, Brentwood Village Apartments, Capitol Manor, Capitol Towers, Capitol View Plaza, Columbia Heights Village, E. Street Apartments.

Eastern Avenue Apartments, Edgewood Terrace Apartments, Section II, Fairmont Square, Foster-House, 46th Street Apartments, Gibson Plaza, Glen Arms Apartments, Glendale Gardens Inc.

Golden Rule Apartments, Golden Rule Center, Hedlin House, Immaculate Conception Community, Langston Lane, Immaculate Conception Community, Langstan Lane, Lincoln Apartments, Lincoln-Westmoreland, Mayfair Mansions, Park Road Apartments.

Parkway-Overlook East, Pentacle Apartments, S. Street Apartments, Samuel Kelsey Garden, Apartments, Sayles Place Homes, Scord I, Vally Wind, Shaw Urban Renewal -- Parcel 15, Southern Avenue Inc.

Stoneridge 1 & 11, Trenton Terrace, Twelfth Street Apartments, Tyler House, Urban Village, Washington Apartments.