The mall opened in March 1968, with three anchor stores and 58 smaller shops. It was built by May Company and the Strouse Greenberg Company, and designed by John Graham, Jr. and Ward and Hall. The original anchors were Hecht's, Garfinckel's, and Sears. Smaller shops included a Bond Stores outlet. The Mall was also where longtime fugitive William Bradford Bishop bought a ball peen hammer and gas can to kill and burn his entire family on March 1, 1976. The old mall logo was an owl-shaped "M". A mid-1970s expansion included a $4.5 million, 155,000-square-foot (14,400 m2) Woodward & Lothrop store and 60,000 square feet (5,600 m2) of additional retail space for 40 stores. The last renovation completed in October 1991 included new floors, brass railings, glass elevator, which was removed in 2013, and removal of all the fountains to allow for more kiosk and seating space. The grand re-opening featured a concert by Tony Bennett. An expansion wing featured the first Nordstrom in Maryland and the third in the Washington, D.C. metropolitan area, and Crate & Barrel. The Boulevard Cafes food court is located on the second level.
A plan to expand the mall by 360,000 square feet (33,000 m2) was approved by Montgomery County in September 2007. With the expansion, Westfield Montgomery will have more than 1,500,000 square feet (140,000 m2), the fourth largest mall in the Washington area behind Tysons Corner Center, Westfield Wheaton, and Fair Oaks Mall.