Do you and if not, you should have a term in the lease which states something like: Tenant may not change locks without landlord consent. 

@Kal PaneliyaA contract can be amended before closing with the consent of all parties.

No motor vehicles or things may be parked or placed on the premises without our written consent including motorcycles, trucks, boats, trailer, motor homes, and storage containers.

She would be at work and no one should be home.Here is the KY Statuate:383.615 Access. (1) A tenant shall not unreasonably withhold consent to the landlord to enter into the dwelling unit in order to inspect the premises, make necessary or agreed repairs, decorations, alterations, or improvements, supply necessary or agreed services, or exhibit the dwelling unit to prospective or actual purchasers, mortgagees, tenants, workmen, or contractors. (2) A landlord may enter the dwelling unit without consent of the tenant in case of emergency. (3) A landlord shall not abuse the right of access or use it to harass the tenant.

My agreements specifically state that the clients (tenants) are not to modify the property without written consent. 

The Rental Term for property’s Rental Agreement shall be for 12 months with possible qty. (2) 12 month extensions.The rental amount per month paid in arrears is $________________ per month, starting on __________ (date).These terms may be changed with both Owners of Record and Purchasers written consent.4.

In consideration of Landlord foregoing the installation of a keyed dead bolt device on the back door of the dwelling and for consenting to the Tenants installing a “doggy door” in the back door of the dwelling at the Tenant’s own cost, Tenants hereby waive any and all rights and remedies they may have against the landlord for violations of the Texas Property Code and for any and all damages which the Tenants may suffer as a result, or in any way relating to, a keyed deadbolt not being installed on the back door of the dwelling or as a result, or in any way relating to, the allowance of a “doggy door” to be installed in the back door of the dwelling.

You will need to get a consent form signed by the seller for them to talk to you or have him on the phone with you; but you may be able to get them to freeze the process temporarily while you try to work something out.

Someone who may buy something from you is your prospect, not your partner.Next, in many areas of real estate and business law, a partner will be seen to have given you consent to conduct business.

I'd also stop by the police station and inform them of what you are doing and show them your written consent, they might laugh if it isn't a formal notarized consent.