Relax.....if this is the biggest mistake you have made, you are doing fine...If its really freaking you out, talk to the tenant and let them know there was a small error on the lease and either amend it with a new section they sign, or make a new lease with the correction.

For example: an appraiser will not take into consideration googles announcement, only sale comps and competing properties.Often times the correct answer is a mix of both inputs.All that said $200k sounds low and I don’t think anybody here would recommend taking any action before at least getting an appraisal.

@Aaron Klatt can be correct. 1, 3 bedroom unit can cost you, minimally 30k if it's just updating, but then again there can be more things that need to be done, especially with a 1901 home.

Knowing how to price your property is key when starting out on Airbnb, our tools allow you to analyse your competitors and price accordingly.

After the fact, a bookkeeper can possibly correct your books and maybe you can figure out the extent of her theft.B.

@Kelsey GreimThats absurd ..Refuse to close until an updated lease is signed by all parties that includes the correct terms and regulations you expect in the lease agreement .

Lots to look into here, might be worth hiring a professional to make sure you do it correctly. 

What in your experience are some of the best online tools (paid or free) to analyze rental properties as well as flips?

You could also build in closing costs if done correctly.

With the possibility of upcoming market corrections you potentially may lose a great deal more holding on.