If they are on a month to month, you may want to first consider keeping it that way - you don't know what kind of tenants they are until after you move in and it is possible to make changes that do not require a tenant's consent with a rental agreement.  

., without my consent.2) 100 % of one full month’s rent to be paid under every new lease.3) 50 % of one full month’s rent to be paid for every renewal or extension of lease.My property will rent for about $1400 per month.

Which by a simple conversation with you they could have figured out by a simple conversation with you and you could have avoided the HARD inquiry pull (any pull by a lender will ALWAYS result in a HARD PULL on your credit, they have to get your consent before doing so). 

In a sub-to, you don't really assume the seller's mortgage, that cannot be assumed without the lender's consent.

Typically all, or at least a portion of the cost is due upon signing and it's not uncommon for a change order fee to be applied with each change order.It's possible that the contract states that if you give verbal approval prior to signing, you shall be deemed to have consented to the change and any increase in the cost.

Many Realtors here simply got the owner's consent not to present all offers just for the low ballers, they go to the trash basically and those that make such offers are tagged by Realtors as nuisance bottom feeders. 

If it means you need permission to have access to see the mortgage then the owner who is moving out can sign a consent for that. 

If you do without their authorization, it can be a violation that can be considered a default or allow them to call all payments due, all depending on the wording of the security instrument.If you pull up a standard Fannie uniform instrument and look at clause 18 (or close to that number) you will see transferring any interest in the property without lender's prior consent will accelerate the loan to have payments due to get an idea where to find it (if you are getting a fannie loan) or what some of the identifying language may look like.

Here, and I would imagine in most places, you would require the written consent of the tenant to run a credit history or background check on them,.

"This contract is assignable with written consent from seller."