Bholanath Dham i.e. 33/2 Beadon Street are owned by an old traditional family who perform Durga Puja (as was mentioned by the lady from top floor) and fly paper balloons in Diwali!

I think a bit of FB sleuthing and research has brought me close to the owners of 33/2, Beadon Street, Bholanath Dham, -- they might have been owners back in the time of Dr. Shashikumar Sengupta (my Thamma's childhood) and back in the time of Kalinath's passing !!!! keeping fingers crossed! Since the family seems to perform a Shiv-Durga Puja (which justifies the name of the house "Bholanath" which my father says had always been the name), and all other old rituals like paper balloons etc, it seems to be a family with deep roots in that house!