MENLO PARK, Calif. (May 18, 2016) – Tarlton Properties, Inc. (TPI), a commercial property development and asset manager, and Principal Real Estate Investors announced today that AtheroMed, which was originally acquired in 2014 by Volcano Corporation and acquired in 2015 by Royal Philips, expanded their current lease from approximately 6,700 square feet at TPI’s Menlo Labs’ 1455 Adams Drive building to approximately 10,000 square feet at 1530 O’Brien Drive in Menlo Business Park.