PORTLAND — A group of Portland residents has formed an organization to oppose development projects that members consider out of scale and out of character for Portland.

The group, Keep Portland Livable, opposes the “midtown” project proposed for the city’s Bayside neighborhood. The project could include 675 market-rate apartments in four towers of about 15 stories each, two parking garages and 93,000 square feet of retail space.

The group’s founders, Tim Paradis and Peter Monro, said in a statement Monday that the group hopes to stir greater interest and activism in the broader development plans for Portland. Group members also want to maintain the city’s unique qualities.

“We should be creating lively, livable communities like Portland’s other neighborhoods,” said Monro, a landscape architect whose office is in Bayside. “The midtown project is a concrete canyon that will destroy our uniqueness.”