More than a year behind schedule, the vacant building at 241 and 249 Danbury Road and 16 and 22 Cricket Lane, which is across from town hall, is moving closer to housing state-of-the-art medical facilities.

Danbury Road Associates LLC, which owns the building, has applied to the Planning and Zoning Commission for a special permit to expand it. The application is up for its first public hearing on Oct. 10 at the town hall Annex.

Renovation plans were first announced in 2015, with its opening originally planned for this summer.

The building is to grow from 42,309-square-feet to 51,876-square-feet, according to plans on file at the planning office. Parking spaces will expand from 278 cars to 342 cars.

The coverage on the 5.9-acre lot is going to grow from 50.4% to 52.6%, which is allowable under zoning standards. The property is zoned as Design Retail Business district.

The premises include a principal office building, a smaller building just south of the Cricket Lane driveway entrance that has been used as a conference center by previous tenants, a building in the middle of the site that was used for support services to the principal office building, and a residence at the southern rear of the site that has often been home to the property’s caretaker.

Danbury Road Associates proposed to raze the support building and the residence, renovate and reskin the principal building and make certain site improvements. The owner wants to build a third floor to the northerly wing of the existing principal building.

The proposed renovation and expansion is compatible with the town’s Plan of Conservation and Development, attorney Casey Healy said in his application statement.

The town plan states that additional business uses should be encouraged along this section of Danbury Road, he added.