LINCOLN — A Cranston developer has proposed building 70 condominium units for residents 55 years and older on 24 acres off Breakneck Hill Road, town officials said.

The project, dubbed Residences at Stone Creek, is planned by Breakneck Hill Development, of Cranston. If built, it would include 26 duplex units and 6 triplex units on the site, which is across Breakneck Hill Road from the YMCA complex, Town Planner Albert V. Ranaldi Jr. said. The 18 units in the triplexes would be priced as affordable housing, Ranaldi said.

The units would have one- and two-car garages, Ranaldi said,

Ranaldi said the project would be connected to the town’s sewer system and to do that the developer has agreed to upgrade the pump station that handles the houses in the nearby East and West Butterfly Way neighborhood. That helps the town, Ranaldi said, because the pump station serving that area is operating pretty much around the clock. Increasing its capacity will reduce the strain and may help alleviate sewage-system problems in that area.

Breakneck Hill Development and the YMCA, which hopes to expand its operation across the street, have agreed to split the cost of the sewer system improvement, Ranaldi said.

“Having them bring in their own sewer line was one of the big things that made this project move forward,” Ranaldi said. The land under the development probably could not have supported septic systems for more than a dozen or so houses, he said.

John DiBona, the lawyer for Breakneck Hill Development, could not be reached for comment.

The site is zoned RS-20, a residential zone that normally does not allow such multi-unit development. But because the 18 units in the triplexes are being designation as affordable housing, state law allows the Planning Board to permit the development in that zone anyway, Ranaldi said.

The proposal is before the Planning Board, which had referred it to the Zoning Board of Review for its examination. The zoning board did not endorse it, Ranaldi said, because of what it felt was a lack of information and concerns about traffic flow. That opinion is not binding on the Planning Board, he said.

The Breakneck Hill Road project is not the only over-55 housing development being planned in town. In May, the Planning Board approved a proposal from a Pennsylvania group that wanted to build 178 units of elderly housing next to the Lincoln Mall.

That development is intended for 12 acres next to the mall and behind the Marriott hotel on Route 116. It would also face Old Louisquisset Pike where that street snakes around behind the mall. The project is called Highland at Lincoln and is being proposed by Lincoln Development LLC of Havertown, Pa.

jhill@projo.com