Washington, D.C., law firm Hogan & Hartson is negotiating to take at least 40,000 square feet in the planned Legg Mason Tower, a 24-story office building to be constructed on the fringes of the city's business district at the waterfront Harbor East development.

The law firm would be the first tenant to follow Legg Mason to the new office tower, where rents are said to be the highest in the city. Legg is slated to move by summer 2009 from its signature office building at Light and Pratt streets.

Hogan has about 45 local lawyers and about 30,000 square feet at Harborplace Tower, a waterfront office building at Calvert and Pratt streets where its lease is set to expire in October. The building is connected to the Gallery shopping mall.