to pay out monthly rent to prior investors.

It sounds like you will not have lived in the property for 2 out of the 5 years immediately prior to selling it. 

Just make sure your attorney reviews it and make all necessary adjustments prior to signing.

I am looking to purchase this investment duplex property which was built prior to 1940.

The sellers have not been responsive when asked to provide that information, which is why I was wondering if it's a typical practice prior to submitting an offer. 

While many of these issues are important considerations and should not be ignored or overlooked, there are other more crucial criteria that you must question and evaluate first.The critical risk criteria that you must review and evaluate prior to making your final decision on which 1031 Exchange Qualified Intermediary to retain includes, but is not limited to, the following areas:Technical capability of the 1031 Exchange Qualified IntermediaryInternal processes and audit controls to safeguard your 1031 Exchange funds and assetsUse of Qualified Trust Accounts or Qualified Escrow AccountsDecision criteria and guidelines for investment of your 1031 Exchange fundsProtection from potential errors or omissions by the Qualified Intermediary (E&O Insurance) Protection from potential theft or embezzlement of 1031 Exchange funds (Fidelity Bond) An experienced and professional 1031 Exchange Qualified Intermediary will understand these concerns and should be happy to discuss these crucial issues with you.

See if you have any pics prior.

I think the most important thing would be to have a strong contract in place and to have done thorough due diligence on the front end prior to signing up a contractor.

I am assuming that these expenses should be factored into your budget prior to calculating your cash flow.

Again, others might feel differently here.3) property level due diligence: (takes seconds to weeks per deal): here is where I drill in with the low-level details.a) pro forma popping: I examine all the assumptions, and see if they are overoptimistic or not.