I'm not an attorney and this is personal opinion only and not egal advice. 

In prime neighborhoods (eg; all of Manhattan, Park Slope/Williamsburg/etc. in Brooklyn, and others) the standard is for tenants to pay without question. 

Reach back to your friend with an alternate purchase plan and you need to come up with various option . eg:- All cash 50/60 k ,since you already planning to putdown 45k find the rest of the money via Private lender or from family & friends and close the deal .If your friend is firm on the price perform 1)principal only payment 2.)Interest [Rate under 4.5%]only payment with Balloon at end of 7th year  .Good luck

My experience (in buying several severely mismanaged properties) is that the owners will likely have equally mismanaged tax records (eg; all investment activities lumped together, etc.).My due diligence for an area that I'm "blind" to (have never worked in before) would roughly be as follows:-Speak w/ local realtors & property managers to determine appropriate market rent for all units-Get copies of all leases to verify current rent roll-Speak w/ my insurance agent, get appropriate quotes-For any utilities I'll be responsible for, find out local market rate for electricy/gas/water & sewer and use what I know to be "average" consumption for those services-Use estimates I know are sound for maintenance/capex reserves, etc.

Well, are you sub-metering (ie someone needs to read/report) or just flat-rate (eg all 1 beds pay $50/month) billing?

Sí estás disponible avísame!

Todavía hay personas buscando una casa a mover, pero hay menas casas disponible.

Es gibt wohl irgendwo Verbot hier auf Deutsch zu schreiben, aber egal. 

@Gerrett is spot on :)  In your offer, be sure to statepersonal property, eg: all existing furniture and fixtures are included in the saleexisting leases are to continue enforcethe current owner is to require all tenant to complete a statement of all oral or written promises made to them, and which fixtures if any belong to them and then to be sent directly to the purchaser upon acceptance of the offer.security deposits are to be transferred to the purchaser at close of escrowany prepaid property tax accounts are to be assigned to the purchaser

Étant personnellement sur place pour choisir les investissements de mes clients , je suis disponible pour renseigner celles et ceux qui désirent investir dans l’immobilier à Cleveland .