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ATLANTA-Metro's Gwinnett County, no longer rural, is on the path to urban status, staffers in the county's planning department tell GlobeSt.com. Internationally known Yamasaki Associates Inc., a Troy, MI-based architectural firm, has filed conceptual plans with the county for a mixed-use structure that would be the tallest in Gwinnett when completed.

According to the plans, Yamasaki wants to build a 25-story, 300-foot tall residential condominium community that would also have 112,000 sf of retail on four floors and a 10,000-sf garden atop a parking deck. The project would rise on a 4.7-acre tract at Steve Reynolds Boulevard and Singleton Road near Interstate 85. The tallest building in Gwinnett County is the 17-story, 187-foot tall Marriott Hotel at the Gwinnett Place Mall.

A Yamasaki spokesperson tells GlobeSt.com the company is still "working out development costs and other development details" for the so-far unnamed project. However, area construction sources familiar with comparable undertakings in metro Atlanta tell GlobeSt.com the venture will probably have a hard construction cost of about $200,000 per unit for the condos; about $100 per sf for the retail component; and about $10 million for the parking deck. That would place the estimated development cost at nearly $75 million, according to construction sources.