I was passing through Danbury today, so I decided to stop in at the Marcus Dairy Bar. There was a small sign posted at the entrance, and I copied it verbatim:
"To Marcus Dairy Bar Customers:
Plans have been submitted for site plan approvals to renovate the property into restaurant and retail space.
Our Dairy Bar Restaurant will remain open and continue to serve you throughout the permitting process. This process may take a year or more. Plans to renovate, improve, and re-open a new restaurant is included with our permit.
In the interim, we are priveleged to continue to serve you."
Their menu and cash register receipt lists their phone number as 203-748-9427. Their menu also lists their web sites:
For the events at the Dairy Bar: http://www.marcusdairy.net
For the dairy itself: http://www.marcusdairy.com
So, call before going.
I don't know what construction codes are like in Danbury. But in Manhattan, I have seen developers build skyscrapers around buildings like the Dairy Bar, and the business remained in operation during construction. It just may not be profitable to keep the restaurant open dring construction with all the juggling that has to be done. Or maybe the company did not explore that option yet.