Around 1888 a 4-room addition was added on the west side (rear) of building along with a baptismal on the altar stage.

Also still intact, however sealed in from the Main Sanctuary, are the original Negro galleries which were closed off around 1849 In 1854 several members left with a "mothers blessing" to create the South Framingham Baptist Church in South Framingham.

The name was changed to Park Street Baptist Church shortly thereafter.

In 1998 due to dwindling membership in both congregations, the members of First Baptist Church and Park Street Baptist Church began worshipping together.

The church building was listed on the National Register of Historic Places in 1980.