The city council approved Mayor Jeannette McCarthy's agreement to buy the southern portion of the UMass Field Station on Beaver Street, Monday for $17.4 million.

Last year the council voted to use $14 million in Community Preservation Act (CPA) funding to buy the property, and then this week approved an additional $3.4 million to buy 28 acres of the 58 acre property that is home to some seven tenants.