Google’s workspaces in Cambridge’s Kendall Square will grow to 850,000 square feet with imminent construction of a new 400,000-square-foot office tower and renewals for 450,000 square feet at two other buildings at Boston Properties’ 2.6-million-square-foot Kendall Center development.

Construction of a 400,000-square-foot office tower at 325 Main St. will begin in 2019, with Google occupying all 362,000 square feet of office space in the building, Boston Properties executives said in a conference call to discuss the company’s first-quarter earnings.

And Bank of America has resolved questions about its future occupancy in Boston with an early renewal for 545,000 square feet at 100 Federal St. Bank of America signed a new 15-year lease for office space, replacing its existing lease that was set to expire in 2022, Boston Properties announced Tuesday.

The bank reduced its occupancy in the 37-story tower by 137,000 square feet in 2016 and another tenant, Wellington Management, renewed its 156,000-square-foot lease and relocated within the building to make way for Putnam Investments’ new headquarters. Putnam last fall moved from One Post Office Square into 250,000 square feet on 11 floors at 100 Federal St.

The new lease brings the 1.3-million-square-foot tower up to 99 percent occupancy, Boston Properties said. The Boston-based REIT upgraded the building’s common area amenities in 2018 by replacing the front driveway area with a steel and glass pavilion called The Exchange containing coffee and food vendors.

BofA is the second big financial institution to make a long-term commitment to remaining in downtown Boston, following State Street Corp. to leave its One Lincoln headquarters and occupy 510,000 square feet in the One Congress office tower scheduled for completion in 2022 at Bulfinch Crossing.

Fidelity Investments recently submitted plans to update its 750,000-square-foot Commonwealth Pier office complex in the Seaport District by adding new outdoor public space and plazas, an extension of the pier and 45,000 square feet of retail and restaurant space on Seaport Boulevard. A Fidelity spokesman said no updates were available on the status of the company’s 890,000 square feet at its 245 Summer St. headquarters, which has a lease expiring in 2020.

Boston Properties executives said a third tenant at The Hub on Causeway office tower backed out of a potential lease for the last block of space after it agreed to be acquired. According to real estate sources, marketers Epsilon had been the potential tenant. The company announced this month that it will be acquired by Publicis Groupe for $4.4 billion.