The Allston real estate company said today that it expects to start renting its “moderately priced” units in July, following an interior renovation of the 12-story building at 8 Winter St.

The 50,000-square-foot property is located at one of the four corners of Downtown Crossing.

“We are strong proponents of the mayor’s efforts to improve the Ladder District and are convinced this additional housing will add vibrancy to the neighborhood,” said Hamilton Co. president Carl Valeri, in a statement.

The project will maintain the first-floor retail space and create 40 one-bedroom units and eight studio apartments — renting for $1,950 and $1,650, respectively — with hardwood floors and stainless steel appliances.

The Hamilton Co., owned by Harold Brown, controls about 5,000 housing units in Greater Boston along with 3 million square feet of commercial space.

Brown bought 8 Winter St. in 1982 for $6.5 million. The apartment conversion has been planned since early 2009.