Colin Diefenbach has been with Transwestern for seven years and specializes in property management for various properties in Northern Virginia, where he handles vendor contracts, manages engineering staff, formulates budgets, creates monthly reports for his clients and assists with lease negotiations. He is a member of the Transwestern Regional Engineering Committee, which assists with all engineering operations, technical support and training for engineers throughout the Mid-Atlantic region. Colin is also a member of Transwestern's Emerging Leaders group, a national platform tackling a number of corporate initiatives to aid Transwestern's continued growth. 


Colin joined Transwestern in June of 2010 as a property manager, assisting in the management of the 1.6 million-square-foot Cityline Partners/West*Group portfolio in Tysons, Virginia. Subsequently, he was instrumental in the due diligence for the partial sale of this portfolio. Colin then managed and assisted in the sale of six office portfolios out of foreclosure.
Currently, he oversees the operations of over a million square feet of office product throughout Northern Virginia for both institutional and private investment clients. He manages all facets of building operations, including financial reporting, capital projects, new tenant construction and general repairs and maintenance of the buildings.
His completed projects include historic fa├žade restorations, roof replacements, lobby renovations, HVAC replacements, and numerous tenant build-outs including two GSA leases renewals totaling 136,319 square feet.
His most recent project is the repositioning of a 147,000-square-foot office building in Alexandria, Virginia.


. Founder and president of the Mid-Atlantic region's Transwestern Young Professionals
. Recipient of the Transwestern Mid-Atlantic region's 2011 Rising Star Award
. Member of the Transwestern Mid-Atlantic region's 2012 Management Team of the Year 
. Recipient of the Transwestern Mid-Atlantic region's 2014 Property Manager of the Year Award
Colin holds the Real Property Administrator designation.


Colin has a master's degree in real estate form Georgetown University and received a bachelor's degree in business administration with a concentration in finance from the University of Richmond.