The General Services Administration plans to ask the private sector for ideas about what to put on 22 acres it owns immediately south of the National Mall. Here are some ideas that might come back:

High-end, high-rise housing. Demand for the Newseum apartments, across the Mall on Pennsylvania Avenue, could be a harbinger.

New offices. The government wants its employees in smaller, more energy-efficient space. This is a chance to create that for four or more agencies.

Hotel rooms. Interest is likely to be high, if the fierce competition to convert the Old Post Office Pavilion into a luxury getaway is any guide.

Culture. Expect planners of new memorials and museums to seek space, particularly in the Cotton Annex.

New transit. D.C. officials are exploring whether stops for Amtrak and new commuter lines can be added to the nearby L’Enfant Plaza station.

Retail. The Starbucks at the Transportation Department and new lunch options at L’Enfant Plaza suggest a willingness to be a part of the neighborhood, despite security concerns.