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-80- -3 - Both the DeLeuw, Cather and Wilbur Smith studies propose multiple sites for underground parking facilities in the Mall area that might accommodate up to 80buses and 2,500 to 3,000 automobiles. Construction in the Mall area must consider a high water table, underground utilities, and intervening streets. Costs of construction might be about $12,000 to $14,000 per parking space, not including tunnels, escalators and other special features. Construction and operation costs could be significantly offset by automobile and bus parking revenues. One plan might be construction of three garages (see Wilbur Smith, page 22 for locations) using adjacent streets for access. Construction of a single garage in the area midway between the National Gallery of Art and the National Air and Space Museum and bounded by the Capitol Reflecting Pool, also seems practical. It would serve the Mall and Capitol Hill, provide parking for both buses and cars, and is accessible from Independence, Constitution and Pennsylvania Avenues. A logical next step to determine the feasibility of developing underground parking might be selecting the National Park Service and/or the General Services Administration to perform detailed investigations of construction, engineering, and cost. Also, such an undertaking should be explored and coordinated with all interested parties, especially the National Capital Planning Commission, the Fine Arts Commission, the Architect of the Capitol, and the Pennsylvania Avenue Development Corporation. The Smithsonian hopes it study efforts will prove useful to others, and eventually to the general improvement of visitor access to the Mall. While we do not presently contemplate further action on this matter, please feel free to call upon us for whatever further information or assistance may be helpful. When the DeLeuw, Cather report is completed in a month or so, I would be pleased to forward a copy to your office. Sincerely, Phillip S. Hughes Under Secretary