WARRENVILLE, ILL. — Quantum Real Estate Advisors Inc. has brokered the sale of Cantera Commons in Warrenville, north of Naperville, for $3 million. The retail property is comprised of two multi-tenant buildings located at 28341-28361 Diehl Road. Potbelly Sandwich Shop occupies a 10,431-square-foot building, while Starbucks and Café Zupos occupy a 7,423-square-foot building. The building was approximately 25 percent occupied at the time of sale. The buyer was a private real estate investor based in Chicago. The seller was a special servicer on behalf of a CMBS trust. Chad Firsel of Quantum represented both the seller and purchaser in the transaction.