Portland-based Portside Real Estate Group, one of Maine’s largest residential real estate firms, has acquired competitor RE/MAX Heritage of Yarmouth for an undisclosed sum as part of an ongoing expansion effort in southern Maine.

RE/MAX Heritage has been in business for 17 years, according to a Portside news release. All of its agents and staff will be joining Portside, it said, and RE/MAX Heritage will take on the Portside name, giving Portside locations in Yarmouth, Falmouth and Portland.

The combined entity has a team of 53 agents and staff, with a projected sales volume of more than $240 million in 2017, said Portside owner Dava Davin.

“We are thrilled to open our third boutique in Yarmouth and bring Portside’s unique brand to one of the most highly regarded real estate agencies in the state,” Davin said. “Maine buyers and sellers are allowing for the growth of independently owned companies like Portside. This partnership exemplifies that and we look forward to strengthening our reach in southern Maine and beyond.”

Portside is set to open a new, larger headquarters at the end of the month in Falmouth that will buck the real estate trend of remote work and offer agents a place to collaborate with colleagues and have more face-to-face interactions with clients, the agency said.

Founded in 2012, Portside is one of the few local, independently owned real estate firms to successfully acquire a major franchise in Maine.