Eden Properties, a Boston-based property investment firm, has acquired a six-story office building in Midtown Boston from Synergy Investment & Development for more than $400 per square foot.

The building delivered in 1910 at 26-30 West St. along the Washington Street Corridor in Boston’s Ladder District. Renovated in 1982 and again in 1991, the building totals 53,034 square feet and is anchored by SEIU with the remaining space comprised of retail…