Gray tower is Textron (Cessna, Bell Helicopters, etc.) world HQ. Plus some law firms and assorted tenants.

One Financial (the large white stone tower) has several floors of BoA, but that is recent. It was built as the Hospital Trust Tower (a bank) and they occupied the 28th Floor Penthouse and several others. Then a large law firm, Edwards and Angell took over much of that space, but they have since changed names and stopped being locally headquartered and downsized a bit in the building. The Santander is just a branch in the lobby. The rest of the tower is several law firms, Morgan Stanley financial services, and some other assorted tenants.