But I've actually seen where you have the ability to go back 3 years and amend your return and then get the savings today.  

Of course, you could certainly file an extension and/or file an amended return later if they notice any changes. 

I was thinking about going back to the seller and seeing about amending the purchase agreement to say 85 15 as that was one of the items that was mentioned on the irs info on the deprecation.

I would like to amend the rental agreement and raise the late fee so high that she would pay on time. 

Rul. 66-111) In 1973, there was an amendment that allowed for the component method if the costs could be allocated by value and condition.

If there is no instruction regarding maintenance management in the lease then you can add an addendum that includes that instruction and have the tenant sign the amendment. 

I am willing to get you are in the clear here since the request to amend the future 1 year lease agreement came from the tenants.

@Peter ThirawankanokThe IL Legislature has defined recently amended the real estate act of 2000 so as to define wholesaling as broker conduct (this conduct was previously undefined and thus there is safe harbor for prior acts).

There is just a few small items in an amendment that allows them to sub/STR.  

Can I have the lease amended to provide for one?