ATLANTA — The Ardent Cos. has purchased five buildings within the 14-building Piedmont Center office park in Atlanta’s Buckhead district for $144 million. David Meline, Stewart Calhoun and Samir Idris of Cushman & Wakefield represented the seller, Northwestern Mutual, in the transaction. Gil Burstiner of Hartman Simons, a commercial real estate law firm, represented Ardent in the negotiations. KKR’s Real Estate Finance team financed the acquisition. Atlanta-based Ardent will invest in renovations to the portfolio, including enhancements to amenities and common areas, as well as increased connectivity and accessibility. Ardent acquired The Fountains at Piedmont Center, a four-building office portfolio within Piedmont Center, in October 2016 for $76.5 million. Ardent also owns an office building site within the center that is zoned for additional development.