Courtesy of Bruce T. Martin Photography

Newton officials are taking a fresh look at the city’s receptiveness to life science projects in the wake of two new proposals for lab space.

Mark Development is seeking to amend its 1 million-square-foot Riverside mixed-use development, which gained final approval in October, to replace a planned hotel with life science space.

At the same time, Alexandria Real Estate Equities has submitted plans to convert part of the nearby Riverside Center office property at 275 Grove St. that it bought last year into 62,531 square feet of office, lab and research and storage space. Alexandria bought the 509,702-square-foot complex last year for $235 million.

The Newton City Council tonight is scheduled to discuss whether the lab uses are appropriate for the property, which is located in the city’s Business-4 zoning district.

Mark Development’s Riverside project was originally approved in October for 247,000 square feet of office-lab space along with a 150-room hotel, 43,000 square feet of retail space and 582 apartments. The latest amendment also would reduce retail space by 17,000 square feet and eliminate 27 apartments.

The 13-acre site includes a parcel ground-leased from the MBTA at its Riverside station on the Green Line, along with the former Indigo Hotel property.

Newmark Knight Frank is tracking over 7 million square feet of potential office-to-lab conversions in the pipeline in Greater Boston.

Newton’s discussion comes as other Boston suburbs are taking steps to make themselves more desirable to life science developers.

Lexington recently rezoned its Hartwell Avenue corridor for 115-foot building heights and unlimited floor area ratios, seeking to encourage redevelopment of aging low-density commercial properties.

And in January 2020, Burlington rezoned three properties at 400-600 Summit Drive, 3 Van de Graaff Drive and 60 Blanchard Road to allow life science development by-right.