In an article about Greater Baltimore Medical Center's expansion in Wednesday's Business section, The Sun incorrectly identified the hospital with the most baby deliveries in Maryland. It is Holy Cross Hospital in Silver Spring, which had 7,269 deliveries in its last fiscal year.

The Greater Baltimore Medical Center at 6701 N. Charles St. will have a groundbreaking tomorrow for the first phase of a previously announced $100 million redevelopment project, including new construction and renovation.

Estimated to cost $70 million, the initial work will include new facilities for obstetrics, acute care and surgery; a 900-car garage; and a 110,000-square-foot medical office building. Another $30 million worth of projects are being planned to meet the medical center's increasing patient volumes and technological advancements.

With 362 patients beds, GBMC already performs more than 25,000 surgeries annually and delivers 4,500 babies per year, the most in Maryland. The expansion is targeted to help it grow in four main specialties: women's health, surgical services, critical care medicine and medical oncology.

* This week is "American City Quality Week," and the Baltimore City Planning Department will hold an Open House in its offices on the eighth floor of 417 E. Fayette St. tomorrow from 3 p.m. to 7 p.m.

Members of the planning staff will be available to discuss specific projects and strategies in the areas of district and community planning, environmental and waterfront planning, downtown development, transportation planning and other subjects.

The American Planning Association and Mayor Kurt L. Schmoke designated American City Quality Week to focus attention on improving the quality of the nation's cities and the value of city planning in the process.

* Ackerman and Co. of Atlanta, whose 5.5 million-square-foot Washingtonian Center is planned as the largest commercial development in Montgomery County, now intends to construct the county's tallest office building as soon as it lands a lead tenant.

The proposed $55 million structure, Three Washingtonian Center, would rise 26 stories and contain 570,000 square feet of office space. The tallest building in Montgomery County at present is a 21-story tower in Rockville.

Designed by Brennan Beer Gorman/Architects, the tower would be the dominant building at the Washingtonian Center complex, which is taking shape on a 212-acre site at the Interstates 270 and 370.

Ackerman representatives say they will begin construction as soon as they find tenants to occupy more than 50 percent of the office space.

"We are confident that this project will attract a major corporate user of the same quality and prestige as Bechtel Power, our first corporate client in the Washingtonian Center," said developer Charles Ackerman.

Bechtel, an international engineering firm, is based in One Washingtonian Center, a 300,000-square-foot office building, and plans to construct Two Washingtonian Center, a 260,000-square-foot building designed by the Washington office of Skidmore, Owings and Merrill.

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Auctions:

* Security Office Park, a group of three office buildings containing 121,661 square feet of office space, will be sold at auction April 16 at 11 a.m. The buildings were developed by a local group called Security Office Park Limited Partnership and are more the 80 percent leased. Atlantic Auctions Inc. is the auctioneer.

* The seven-story, 22,000-square-foot office building that was created several years ago inside the former Hotel Junker at 20-22 E. Fayette St. will go on the auction block April 16 at 1 p.m. The developer is a group headed by Martin P. Azola, who recently filed for protection from creditors under Chapter 7 of the U. S. Bankruptcy Code. Express Auction Services Inc. is the auctioneer.

* A three-story office building at 821 N. Charles St. will be sold at auction April 16 starting at 2:15 p.m. Express Auction Services is the auctioneer.

* A 1.4-acre development parcel at 1920 Forest Drive near the Gardner Retail Center in Annapolis will be sold at auction April 11 at 1 p.m. A. J. Billig & Co. is the auctioneer.

* The Suburbia Building, a seven-story, 47,600-square-foot office building at 5604 Baltimore National Pike, was sold at auction yesterday for $1 million to Fairfax Savings Bank. The institution had foreclosed on the previous owners, a local group called Suburbia Investors Limited Partnership.

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Calendar:

* Lasalle Partners has set April 22 as the date for the ribbon-cutting ceremony for its first Baltimore project, the 414 Water Street Parking Garage. Planned to serve as the base for an office tower, the project actually opened earlier this year and adds 1,100 parking spaces to the Inner Harbor area. Under a previous agreement between the developer and the city, Baltimore has agreed to buy it for $13.1 million. Vlastimil Koubek of Washington was the architect.

* Stanley Heuisler, chairman of the $200 million Christopher Columbus Center of Marine Research and Exploration planned for Inner Harbor Piers 5 and 6, will discuss the project in a talk at the Harbor Court Hotel, 550 Light St., on April 19 starting at 8 a.m.

The talk is part of the "Business Over Breakfast" speaker series sponsored by the Downtown Partnership of Baltimore. Admission is free for Downtown Partnership members and $5 per person for non-members. Reservations can be made through the Downtown Partnership at 244-1030.

* W. C. Pinkard & Co. Inc. will hold its annual real estate symposium April 24 at 4 p.m. at the Maryland Science Center's IMAX Theater, 601 Light St. The theme of the meeting is "Adversity and Opportunity -- Making the Market Work Today." Reservations can be made through Pinkard's downtown office at 752-4285.

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Around the region:

* Deborah Goodman, chairman of Baltimore's Commission for Historical and Architectural Preservation for the past three years, was re-elected for another year at the board's annual election last week. Vice chairman David Norman also was re-elected to continue in his position.

* Bacon & Co. Inc., a development firm headed by Elinor Bacon, has moved its offices to the third floor of 527 N. Charles St.

* The Price Co., a California-based operator of wholesale cash and carry warehouses, leased 31,305 square feet of office space for its East Coast headquarters at Manekin Loudoun Center, 46000 Manekin Plaza in Sterling, Va. The five-building, 116,000-square-foot office park is a joint venture of Manekin Corp. of Baltimore and CIGNA Investments.

* J. Gary Lee of the Lee Organization Inc. is assisting Joseph J. Hock Inc. of Linthicum with marketing and development of the Hock Business Park, a 121-acre, 1.3 million-square-foot industrial park planned for Anne Arundel County.

* The principals of Continental Realty have acquired 100 percent ownership interest in the 52,000-square-foot Carney Village Shopping Center at Joppa and Harford roads.