Reebok’s former Canton headquarters appears to have a future as a single-user corporate campus.

Tufts Health Plan and Harvard Pilgrim Health Care plan to acquire the 600,000-square-foot offices on Royall Street for a combined headquarters as they await regulatory approval for a merger.

Tufts Health Plan spokeswoman Sonya Hagopian confirmed a Boston Business Journal report that the combined organization plans to occupy the entire Canton building after acquiring it from Spear Street Capital, replacing Tufts’ 705 Mt. Auburn St. offices in Watertown and HPHC’s offices at 1600 Crown Colony Drive in Quincy.

Spear Street Capital has simultaneously agreed to purchase the Tufts property in Watertown, the Business Journal reported. Spear Street could not be reached for comment.

Tufts acquired the Watertown property in 2007 for $85.5 million. It’s located in a submarket that’s seen steady growth of the class A office and life science market in redevelopments such as LINX, 65 Grove St. and Arsenal Yards.

Spear Street Capital, which acquired the then-vacant Reebok campus in 2018 for $88 million, previously had indicated it would pursue a multitenant leasing strategy for the 20-year-old complex.

Originally designed for Reebok when it relocated from Stoughton, the campus includes amenities reflecting the company’s athletic gear focus including an outdoor track and softball field, indoor basketball court and merchandise showrooms.

Following the 2018 acquisition, Spear Street sold a 135,000-square-foot outbuilding on the 65-acre Canton property to Trillium Brewing Co.