It was called the Button Box. According to these articles the owner was retiring and looking for a buyer, but then the building was sold and their lease was not renewed. I went there for the first time a little over two years ago only to find it closed down. So sorry.
https://theswellesleyreport.com/2016...ys-button-box/
https://theswellesleyreport.com/2016...ey-button-box/