If they refuse, you might want to walk, or, if the property is an amazing deal - which I doubt based on the conduct of the Vendor - speak with your attorney about whether you have sufficient grounds under the contract to either force them to comply or be made whole for their failure to execute their obligations.

Typically, as a sponsor, you will negotiate enough time to conduct due diligence on a property with a seller that they need in order to be able to place debt on the deal.  

How many times could you possibly need access to the property in order to conduct due diligence?  

The proof is not in their contract....the proof is in their conduct. 

Guess that is a nice thing about RE, you can conduct your business however you want as long as its profitable and meets your expectations.

Any sale should be for near market value and conducted by a realtor. 

There are also some great conferences for this (and some not so great ones) that can help in these areas

They’ve got various retreats and conferences scheduled and I believe are looking to create various levels eventually starting with the current one and then going up cost wise to a couple much higher level expensive ones.

Further anecdotal confirmation of this is the fact that I am looking for work in Detroit and plan to live in my appreciating house in Haslett while I do that.Risks exist but are few in Haslett:-Lake Lansing could fill in or become polluted-(but it was recently dredged and inlets are monitored closely)-MSU could become less popular in sports-(but it's hard to hard to imagine that happening because the University is very supportive of its athletic programs, MSU alumni are numerous in the area, and MSU is in the B10 conference).

A recent conducted made the city aware of how much tax they were missing out on currently...so watch out this may be brought up once again, very soon.