So through day 45 the list can be modified however you want. 

For instance, the tenant could handwrite some additional terms on their copy of the lease, and then claim that the modified copy is the true original. 

Don’t modify your requirements/standards to accommodate a potential tenant.  

You can find a lot of helpful stuff other members have provided for you.I just modified it (as many others have) for my personal preferences.Hope this helps.

@Betty Cruz  You may want to modify your post because you are now putting out to the world that you will not rent to anyone with a felony conviction. 

He wants me to modify the current lease to remove him from it as of May 1. 

I have an upcoming balloon payment and while I’m sure I could talk him into modifying the agreement, he is getting older and I would prefer to cash him out to not be doing business with his estate.

I would modify to my liking and then have an attorney look at it if you don’t feel comfortable with the results.

If so does that mean I now have to modify the sales contract and get the buyer to sign it again?

Buy it off like a regular purchase, and/or modified wholesale transaction with a very long selling time.