The spec project--the 173,382-sf Building XV--is a three-storyLEED Silver design by Dallas-based Morrison Seifert Murphy Inc.,with Rogers O'Brien Construction Co., also from Dallas, in thedriver's seat for construction. Mesa Design Group, another Dallasfirm, is the landscape architect for 6100 W. Plano Pkwy. The shelldelivers in September.

The company, led by Lucy Billingsley, last year sold seven of thepark's eight buildings to Argus Realty Investors LP of SanClemente, CA for more than $130 million. Billingsley retained a103,916-sf office building at 4100 Midway Rd. in Carrollton, thelast one that was built in the 300-acre International BusinessPark. Billingsley's building is 92% occupied and Argus' claim is94%, part of the motivation to add more space, says Trevor Franke,vice president of Dallas-based Peloton Real Estate Partners.

"She's had it planned for years and decided it's time to build,"Franke tells GlobeSt.com. "The park has been a huge success, butthe market wasn't ready for more until recently."