The Rouse Co. of Columbia, Md., developer of Baltimore's Harborplace, has been chosen to develop the proposed regional shopping mall at the intersection of Leesburg Pike and Route 28 in Loudoun County.

The Loudoun County Planning Commission will hold a public hearing on the rezoning necessary for the proposed Windmill regional shopping center on Wednesday at 7:30 p.m.

Project attorney Tom Nalls of Hazel, Beckhorn and Hanes said Rouse has contracted with shopping center magnate Theodore Lerner and Southmark Development of Dallas to develop the mall on the 82-acre site at the southeast corner of the interchange.

Applicants have asked Loudoun officials to change the zoning from PD-IP, planned development industrial park, to PD-SC, planned development shopping center.

Lerner has built major shopping centers in the Washington area and is a joint venture partner with Homart Development Co. in the giant 107-acre Tysons II development under construction in the Tysons Corner area.

He has been involved in efforts to build a regional mall on the site for many years, long before the Route 28 corridor was touted as a potential development center. The corridor's status improved after Virginia announced plans to build its Center for Innovative Technology along Route 28 close to Washington Dulles International Airport.

Although the Loudoun Board of Supervisors had rejected a proposal by Lerner for the Windmill site in 1975, the board unanimously approved rezoning for another regional mall last December on 72 acres on the west side of Route 28 just two miles south of the proposed Windmill site. That shopping center is a project of Nattak Development Co., headed by Washington developer Alan Kay.

Residential and commercial brokers said eastern Loudoun is in the middle of a giant boom in commercial and residential construction and is ripe for a regional shopping center. However, some question if the area can support two major shopping malls.