I think both tenant and landlord should be guided by the terms of the written Lease Agreement. If there's a provision to allow viewings (within reasonable limits) then both parties are guided accordingly.
On the other hand, common sense says, if the tenant refuses, regardless of the lease terms, I doubt the landlord has much recourse other than legal action.
Attorneys are the best and only source of legal guidance for issues of this nature.
PowerHouse Solutions, Inc.
185 Great Neck Rd, Suite 240
Great Neck NY 11021
Licensed Mortgage Banker â€“ NYS Dept. of Financial Services
If you thought my answer was helpful, please give me a "Thumbs Up." Thanks!