I believe you can convert an Illinois LLC to an Illinois Series LLC by filing Articles of Amendment with the Secretary of State.

Nonetheless, should I amend my 2013 return or simply correct the depreciation on this year's (2014) return and not worry about it.

Assembly Bill AB 2962 amends Sections 18662 and 18668 of the California Revenue and Taxation Code with regards to the mandatory withholding requirements on the disposition (sale) of real estate by certain taxpayers.

Last I heard federal taxes are only amendable up to 3 years behind but imagine if you loss 10 years of depreciation benefit but were responsible for the recapture.

I would have guess it would require amended returns for past years.

Further, in some states and with some escrow/title companies, escrow, title, the realtors or some other third party may require the seller to sign an amendment switching the contract from a cash closing to a financing closing. 

The remedy may vary slightly depending.I would put IRS compliance ahead of a clear chain of title, and would ensure that the title attorney produces and records the necessary documents to clarify the chain of title as an amendment to any new deed.I would also get documentation from the title attorney regarding the error.  

You should ask your agent about writing up an Amend/Extend agreement, that extends the closing date.

Require everyone to sign a lease amendment which will clarify the changes you are making to the lease, or terminate the old lease and enter into a new one with the tenant who stays. 

Or should I just make an amendment to the current lease?