SOUTHFIELD, MICH. — L. Mason Capitani/TCN Worldwide (LMC) has arranged the sale of a two-building, 139,471-square-foot office complex located at 16000 W. Nine Mile Rd. and 23100 Providence Dr. in Southfield. The buyer, a local investor, plans to add a new medical wing on the first floor of the buildings to attract tenants affiliated with nearby Providence Hospital. Gary Grochowski and Garrett Middlekauff of LMC represented the undisclosed seller. The sale price was also undisclosed.