CAMBRIDGE — Two tall towers planned as part of the Gaslight District project won’t have a negative impact on the site’s heritage value, according to a heritage impact assessment report.

It’s a mixed-use project that’s to be an economic boon for downtown Galt.

Plans to redevelop the former foundry-turned-outlet-mall at 64 Grand Ave. S. include commercial space, a public square and two residential towers at 20 and 21 storeys each.

They are double the allowed height in the area and raised alarm bells at a public meeting earlier this year. Many worried the towers will overshadow church spires that dot Galt’s skyline along the Grand River.

“The proposed development is not anticipated to detract from the significance of the site,” the heritage impact assessment report written by MHBC Planning says.

It also says the buildings won’t take away from nearby heritage assets like the river.

Scott Higgins, president of Hip Developments, said in an email the towers will be lowered slightly to 20 floors each with a four-storey parking podium at the bottom instead of five.

The final decision on the project remains with council. That is expected next month.

Stone buildings that date back to between 1860 and 1910 have been home to the Southworks Outlet Mall for 20 years. The foundry once manufactured engines, boilers and woodworking machinery and soon added fireproof safes and vaults to its offerings.

Babcock and Wilcox Company came into the picture around the 1920s. That was when the site became more commonly known as the “south works.” The “north works” was located at Water Street and Coronation Boulevard where it still operates today.