As it prepares to open its first U.S. store in September at Boston’s Downtown Crossing, Irish fashion retailer Primark is branching out into the suburbs with plans for locations at the Burlington Mall and South Shore Plaza in Braintree.

Sears is leasing the space to Primark at both properties. Sears and its auto center will continue to occupy 196,000 square feet in Burlington, while Primark will occupy 73,000 feet on the second level of the 1.2-million-square-foot mall, including 54,000 square feet of retail space.

In Braintree, Primark will lease 71,000 square feet from Sears. Sears will continue to occupy 138,000 square feet on the lower and second levels of the 1.6-million-square-foot center. Both properties are owned by Indianapolis-based Simon Property Group.

Dublin-based Primark will open a 70,000 square-foot store in the former Filene’s building at Downtown Crossing for its first U.S. store and has short-term expansion plans for as many as 10 stores nationwide.

Primark previously announced plans to move into former Sears locations in Danbury, Conn.; Freehold, N.J.; King of Prussia, Penn.; Staten Island, N.Y.; and Willow Grove, Penn.

“Sears Holdings continues to strategically transform its real estate portfolio by working with leading retailers such as Primark and mall owners,” Jeff Stollenwerck, president of real estate for Sears Holdings, said in a statement. “Primark will bring increased customer traffic to each of these malls and dramatically enhance the retail shopping experience as we rationalize our selling space to improve the productivity of our stores.”

Primark will take occupancy by the end of the year.