Important questions for bigger deal

[Benjamin Robinson]

What would be some important documents to ask for a deal that is already an apartment building, with tenants, that say they make a certain amount in a year? What are the technical terms for:

how much do they get for rent?
way to disclose how many tenants?
any renovations, and when?
A way to know how much the property cost? 
Or any other important ones?

Or are these all things you must research on your own? Any books that touch on this or post that you could direct me to would be awesome, or if you have the answers yourself and want to chime in I would greatly appreciate it! Thanks, BP!