The largest piece of undeveloped property in downtown Winslow will become home to some 30 residential units and 19,000 square feet of retail and office space if a pre-application filed this week comes to fruition.

The multi-building mixed-use development is planned for a two-acre site at 298 Winslow Way West, on the north side of the street between Winslow Green and Grow Avenue.

The site currently holds two restored 1922-vintage buildings, the old Winslow Alliance Church and the church parsonage.

Both buildings are used as law offices, principally by property owner Chris Otorowski.

Plans prepared by Winslow architect Charles Wenzlau show both structures being preserved.

The 3,500-square-foot church building will become one of the principal focuses of the development, while the 1,300-square-foot parsonage will be moved to the western edge of the site.

Wenzlau’s plan calls for the Alliance building to be enlarged, with the addition creating a courtyard arrangement.

A building containing 10 townhomes will be built in the middle of the site, while as many as five residential buildings, each with three or four two-bedroom units, will run along the site’s northern and eastern edge.

Retail and office buildings, some with residences above them, will occupy the Winslow Way frontage. One of the buildings is conceived as a “general store,” according to the plans.

The plan calls for a total of 148 parking spaces, 70 of which will be in an underground garage.

The complex will be built in phases, Wenzlau said in the application, with the mixed-use buildings adjacent to the existing structures done first.

Wenzlau, who is also designing the Wood Avenue townhomes across the street from the Otorowski property, said in his application that the buildings in the new project will not have a uniform appearance.

“Taking its cues from the older structures on the site, the project will be designed to appear as a series of buildings that could have been built over time,” Wenzlau said in his application.