An article in the real estate section Saturday misstated the amount of space that will be developed at the site of the Lansburgh's Department Store. The Pennsylvania Avenue Development Corp. will be seeking proposals this spring for projects with up to 525,000 square feet on the site.

Here is a list of some of the major projects under way, planned or recently completed along Pennsylvania Avenue NW in the District and the blocks immediately to the north.

1. 601 Pennsylvania Ave., Phase One: A nine-story office complex with 224,000 square feet of office space and 44,000 square feet of retail. It is being built by Westminster Investing Corp. according to a contract with the Pennsylvania Avenue Development Corp. The General Services Administration said it is considering leasing the building for the Federal Trade Commission, the Justice Department or other government use.

2. 601 Pennsylvania Ave., Phase Two: A matching nine-story hotel and apartment complex, also being built by Westminster. There will be 240 hotel rooms and 196 apartments. Construction is due to start this year, with the hotel opening in late 1987.

3. Sears World Trade Building: Recently renovated into 47,000 square feet of office space. It houses Sears Financial Services offices.

4. 601 Indiana Ave.: Recently renovated by Duro Construction Corp., partially leased as the Bob Hope USO headquarters.

5. 625 Indiana Ave. Sold by PADC to developer Farr-Jewett & Associates two months ago for $6.2 million. Farr-Jewett is planning a 137,000-square-foot office building with 10,000 square feet of retail space. Construction is expected to begin in early 1987.

6. Hub Furniture Store and Fireman's Insurance Building: Recently bought by Farr-Jewett, which is planning to renovate the Fireman's Insurance Building and to build a 140,000-square-foot office building on the Hub Furniture site with 9,000 square feet of retail.

7. Market Square: Two 13-story buildings with 379,000 square feet of offices, 70,000 square feet of retail stores and 225 housing units, either luxury apartments or condominiums. Being built by Western Development Corp. of Washington, along with Kan Am Realty Inc. It is expected to be finished in 1988.

8. Gallery Row at 401-417 Seventh Street: A 35,000-square-foot building, with the original 19th-century facades restored, built by Carley Capital Group. First and second floors must be leased for art-related uses, according to agreement with PADC.

9. Lansburgh's Building: The old Lansburgh's Department store, now a historic landmark owned by PADC and leased to the D.C. city government. The city's lease expires in June, and PADC will be requesting proposals for a redevelopment plan for the site this summer.

10. Washington Project for the Arts Building: Carry Albert Properties, owner of the building that houses the WPA, has a contract to sell the building to an undisclosed private purchaser.

11. 717 D St.: Recently renovated former warehouse and fireworks store, now a 23,000-square-foot office and retail project.

12. International Trade Commission Building: A neoclassical federal building that will be turned over to the Smithsonian Institution in the near future. Congress authorized GSA in 1984 to give the building to the Smithsonian as soon as the U.S. International Trade Commission found other quarters.

13. 901 E St.: A multiparcel site under contract by the Quadrangle Development Corp. Development is expected to begin by the end of the year.

14. Carr Property: Oliver T. Carr Co., developer of Metropolitan Square and the company doing the renovation of the Willard Hotel, recently bought six lots along 10th and E streets. The company still is working on assembling its site and will be drafting building plans in the future.

15. Manulife property: Manufacturer's Life Insurance Co. is working on assembling a site on the block bounded by 11th and 12th streets and E and F streets. The company currently owns the Safeway on 11th Street, a parking lot on 12th Street and is planning to build a 160,000-square-foot office building in the next two years.

16. Columbia Square: A 600,000-square-foot office building designed by I. M. Pei & Partners and developed by Gerald D. Hines Interests Inc. of Texas. The building is expected to be finished by late 1986.

17. Pennsylvania Building: A project being developed at 1275 Pennsylvania Ave. by local builder Richard Cohen. The facade and most of the internal construction has been removed, with just the floors and supports left standing. When completed next year, it will have 215,000 square feet of office and 10,000 square feet of retail space.

18. Evening Star Building: A renovation and new construction addition to the 1898-vintage Evening Star Building facing Pennsylvania Avenue. Developer Jonathan Woodner is doing the project under contract with the PADC, and it is expected to be finished by 1989. The project will have 207,000 square feet of office and 12,000 square feet of retail.

19. 1001 Pennsylvania Ave.: A massive, two-phase building being built by the Canadian developer Cadillac-Fairview. It takes up the entire block and incorporates several historic facades around the perimeter. When completed, the complex will have 718,000 square feet of office space and 46,500 square feet of retail.