AYANNA PRESSLEY is on the move in more ways than one.

Sworn in last week as the new representative for the 7th Congressional District and now dividing her time between Washington and Boston, Pressley will also be making a move within her district. Pressley has put her condominium in the Ashmont section of Dorchester on the market and is looking for larger quarters.

According to online sites using the Multiple Listing Service, Pressley’s one-bedroom-plus condo (it includes a small den) adjacent to the Ashmont MBTA station has been on the market for 25 days.

Her congressional office confirmed on Saturday that Pressley is selling the unit and plans to look for a larger home for herself, her husband, Conan Harris, and her 10-year-old step-daughter Cora.

“As our family’s needs continue to change — particularly as my step-daughter Cora gets older — our much-loved condominium in Dorchester simply no longer affords the space our family requires,” Pressley said in a statement. “As a result — and after much thought and consideration — my husband, Conan, and I have elected to pursue the purchase of a new home here in Boston. We are currently exploring different housing options in the city, and we look forward to finding a place to live that provides our family the space it needs to thrive.”

For more than a decade Pressley has made her home in the Carruth Building, a 116-unit transit-oriented development project adjacent to the Red Line’s Ashmont Station. The building, which opened in 2008 and includes a mix of ownership condos and affordable rental units, with retail businesses on the ground floor, has been a cornerstone of the revival of the Ashmont business district.

Ayanna Pressley greets a resident outside Ashmont Station, adjacent to the building where she has lived since 2008, during a campaign “thank you” tour a week after her Democratic primary victory in September. (Photo by Michael Jonas)

Pressley bought her 897-square foot unit in 2008 for $237,500. It’s listed on the market for $409,000.

Pressley’s statement did not say whether she plans to look for a new home in Dorchester, but indicated that she would be staying in Boston. The 7th Congressional District includes about three-quarters of Boston, half of Cambridge and Milton, and all of Chelsea, Everett, Randolph, and Somerville.

Boston has long been Pressley’s home, not to mention her political base following her election in 2009 as the first African-American woman to serve on the Boston city council. Another factor ensuring she remains a Boston resident is that Pressley’s husband works for the city and falls under its residency requirement for municipal employees.

Pressley scored a stunning upset victory in the September Democratic primary, defeating 10-term incumbent Michael Capuano of Somerville. She ran unopposed in the November election and was sworn in this month as the first black woman to represent Massachusetts in Congress.