I have a few questions here: how long is the lease term? Is your wife the only tenant in the building? If not, does he treat the other tenants the same way? What is his reasoning for wanting a background check on the employee? What kind of business does your wife operate? Are the changes the landlord makes to the lease made in writing or are these verbal requests?
Any change to a written lease must be in writing and signed . It may be beneficial for your wife to hire a lawyer to handle communications with the landlord to protect her rights under the lease agreement.
Answered on Apr 18th, 2014 at 1:20 PM