MILWAUKEE AND WAUKESHA, WIS. — Colliers International has brokered the sale of a six-building office portfolio in Milwaukee and Waukesha for $37.7 million. The 392,021-square-foot portfolio includes a mix of single- and multi-tenant buildings. At the time of sale, the portfolio was 92 percent leased to 23 tenants, including Von Briesen & Roper, Morgan Stanley, Aurora Health Care and DentaQuest. Tom Shepherd of Colliers represented the seller, LSOP WI LLC. Felton Properties was the buyer. Colliers will handle property management services on behalf of the buyer.