Should I have them sign it also as a consent?

Providing an inspection clause (should be in your lease anyway) that includes your agents and government entities with your consent would open that door.I would disclose that the area; Over there use to be used my the military during WWII for munitions testing, but this yard was tested years ago before they built the area up.

They certainly can not provide you the other offer without written consent from the other party!

Landlord reserves the right to only pay for repairs that he/she authorized in writing.ALTERATIONS OR REPARATIONS BY TENANT: Except as expressly provided in this Lease or by applicable laws or regulations, the Tenant may not alter or make repairs to the Premises without the Landlord’s prior written consent.

Here is what the lease actually states:Guest(s) staying over 15 days without the written consent of OWNER shall be considered a breach of this agreement.

One is making sure that your purchase agreement states that the seller is not allowed to enter into any material agreements (like signing new leases) without your consent while the property is under contract.

If a seller agrees to finance a deal that can be put in the option agreement and you need to make that subject to the seller's acceptance of that borrower, staying out of assigning your obligation to another without seller's consent.

By our agreement, space heaters are not allowed without prior written consent from the landlord.

It is important to have all prospective tenants complete the same process (submit application and application fee, provide proof of income, consent to thorough credit/criminal screening, etc) If you have a gut doubt about an applicant, chances are their application/screening will highlight something concrete that you can deny their tenancy (bad credit, insufficient income, criminal record, etc.)

If you did the deal without notice and consent in many areas of the counrty, you may well have a problem with the lender calling the loan due.