The address is tagged incorrectly.
The address listed in wikipedia is DD-36, Salt Lake, Sector-1, Kolkata-700064, which would give us
...
addr:housenumber = 36
addr:block = DD
[[addr:place = Sector-1]]
addr:city = Salt Lake
addr:postcode = 700064
...
The address listed on their website is DD Block, Sector-1, Salt Lake City
Kolkata, West Bengal 700064 which would be the same as above just without the housenumber 