CHATHAM, N.J. — Redwood Realty Advisors has brokered the sale of 258 Main St. in Chatham, about 30 miles west of Manhattan. The $3 million price represents a capitalization rate of 5.2 percent. Built in 1927, the 12,000-square-foot, mixed-use property includes 10 apartment units and two commercial spaces. Redwood represented the undisclosed buyer in the transaction, a repeat client of the firm. The buyer plans to renovate the units in an effort to enhance the value and performance of the building.