The owner of a Dorchester-based construction firm hopes to demolish his existing office building near Peabody Square and replace it with a five-story mixed-use complex with 20 apartments.

The initial plans for the project, which will trigger a review process from the Boston Planning and Development Agency (BPDA) and require variances from the city’s zoning board, were shown to members of the Ashmont-Adams Neighborhood Association at their monthly meeting last Thursday.

Steven Connelly of Connelly Construction is also planning to appear before the membership of the St. Mark’s Area Civic Association in February. His proposal seeks to demolish the existing single-story commercial structure at 1857-1859 Dorchester Ave. that currently houses the offices for Connelly Construction/Management. According to plans shown to the Reporter, the new 28,555 sq. ft. building would also house two commercial units on the ground level. The current proposal estimates that 24 parking spaces would be included on the site.

Connelly won community support and city approvals last year for a smaller, three-story apartment complex at neaby 8 Banton St. That project is expected to begin this year.