Do you have experience with project management or know someone who does, or do you just have money burning a hole in your pocket?  

But she did miss the extra bedroom & bath we had drywalled off. 

@Nick StangoThere's really no value in a 15 year mortgage if you have a choice.If your goal is to pay the place off as quickly as possible, you might as well take a longer amortization and make extra payments.

If that is the case you might consider an extra opener affixed to the wall if its close enough, then everyone pushes a button once they go in. 

That extra bit of personal space is very desirable compared to my competitors who do not have it.

I added some extra space for data to reflect that.  

Never burn bridges.

We faced two issues in escrow: because of the HOA lien foreclosure we had to do some extra searching to find a title insurance company willing to issue a policy; getting a payoff was an issue until someone at escrow obtained the last four digits of the SSN and used the bank's automated system to get a payoff.The second situation was similar but this one we kept as a rental.

I thankfully have a resident who is a locksmith and I keep extra locks with my tools.  

If you want to squeeze a bit of extra money out of the deal as you should, then you need to contact your county auditors office about lowering your assessed value.