The more wordy a document is the more susceptible confusion will take place.

Document how you want your system to run, and make tweaks and changes as you go to be more effective.

A deed and other documents are filed at the registry of deeds.

However, the seller won't provide copies of the current leases or any financial info like tax returns, income statements, etc.He sent a typed document that listed all current expenses and the rent for each unit but just his word and no official docs.He keeps stating that he wants to sell "As Is" and doesn't want a lot of hassle.

Maybe I misunderstood you but you’re saying they don’t have additional documentation for those water/sewer/electric numbers so it must be the correct numbers ?

This will ensure everything is legal, documented and prevent another landlord from being hit by the train wreck.

The first flip there was no issue and I don't think they even asked if it was a flip or rental and they were able to use all of my documentation that they used for the rentals.  

They will also know what you need to prepare for financially and document wise.

All leases must be in conformance with, and make specific reference to, the legal documents of the Association.

They will have all the info and documents you need to get up and running.