I just noticed that you mentioned it was a live/work space so you might have a commercial lease.
Check your lease carefully. If you have a standard commercial lease it is probably "triple-net", which means you pay taxes AND insurance AND maintenance.
It is typical (and perhaps required by law -- I don't know), for you to receive an itemized statement from the landlord outlining all of the expenses that make up your extra payments.
It sucks, but it is how leases are done in the commercial realm.
Also, you can look up the property taxes assessed in the building
here