McCormick Properties Inc., which sparked the building of about 3 million square feet of office space in the Shawan Road area north of Baltimore in the past decade, has embarked on a new development expected to be the base of an estimated 2,500 Baltimore County jobs.

Plans include eight office buildings on the 53-acre Shawan Center here, which has become a mecca for corporate headquarters buildings. A new shopping center is scheduled to open in September, and the Mariott Hunt Valley Inn is undergoing another expansion to 400 rooms.

The McCormick firm, a subsidiary of the Baltimore-based spice and food company, expects to spend $1.5 million to install utilities and roadways for the Shawan Center. The first $5 million speculative office building is scheduled to be started this fall and seven other buildings are planned for the landscaped site.

Leonard Gerber, president of McCormick Properties, said McCormick-built Hunt Valley office buildings are 99 percent leased, and that other corporations are expected to locate their headquarters in the new Shawan section opposite the Hunt Valley Inn. Current are in the range of $13 a square foot, according to Gerber, but new buildings will be more costly.

The Shawan Center site adjoints the new Hunt Valley Mall and formerly was part of the total propertly owned by the Grand Lodge of Ancient, Free and Accepted Masons of Maryland, whose Bonnie Blink home overlooks the new devleopment site.

In addition to its Hunt Valley and Shawan Center developments, the McCormick firm has two other office building centers, one on the Baltimore Beltway and the other north of it, and another project getting started on the Washington Beltway.

Gerber said ground is being prepared for the start of construction of the 250-acre Inglewood Business Community at Landover. That site, diagonally opposite the Landover Mall and adjacent to Capital Centre, is scheduled to be developed into a campus-like office complex that may include a convention hotel.

Hunt Valley, which was virtually undeveloped until McCormick built the original inn in the late 1960s, has blossomed into a major concentration of corporation and business interests that include C&P Telephone, Westinghouse, Burroughs, Western Electric and other firms on 500 acres at the intersection of Shawan Road and I-83. The site is about 19 miles north of the rejuvenated Baltimore inner harbor area and only a few miles north of Timonium fairgrounds.