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New York State real estate laws provide little, if any, protection to commercial tenants. The law holds that the commercial lease terms govern heating, cooling and other utility issues. The lack of sufficient heating is an issue of breach of the lease and the remedies available under the lease. Your lease may have a specific heating requirement, but it sounds like it does not. If there is not minimum requirement then the issues becomes if the lack of sufficient heat, 60 degrees, is a material breach of the lease. Unfortunately, that issue, if the landlord refuses, would be one that a judge would have to decide.
You should, put all these complaints in writing in a formal letter to the landlord and demand that the defects be cured as per the lease. Try to tie the lack of heat to a specific clause in the lease if possible. (Commercial leases are not subject to the same requirements to provide heat during the winter and "implied warranties of habitability" as residential leases, you can probably make some general claims that the landlord is responsible for heat, and maintenance, and a catchall legal defense that the lack of adequate heat is a breach of your “quiet enjoyment" of the premises, and your use is impaired by the landlord's negligent or willful failure to maintain adequate heat. Send the letter to the landlord certified mail, return receipt requested or some other form or trackable delivery.
If you assert those defenses in the letter, and the landlord still refuses to increase the heat you will have no option but to bring the landlord to court for the breach of the lease claims I outlined above.
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