Transwestern Closes Robust Year With Five Multifamily Sales, Bringing Total To $650M News February 11, 2020 .com. ABOUT TRANSWESTERN Transwestern Commercial Services (TCS) is a privately held real estate... Learn More Dean Sigmon Executive Vice President Bethesda, Maryland (301) 896-9089 Robin Williams Executive Vice President Bethesda, Maryland (301) 896-9070 Michael D'Amelio Vice President - Mid-Atlantic Multifamily Group Bethesda, Maryland (301) 896-9077