It can only be cancelled if the terms and conditions are violated.  

I was originally going to buy a a 2 unit (Unit A is 3 bed/2 bath and Unit B is 2 bed 2 bath) in great condition, but was outbid.

We have invested about 20k in repairs and the house is now in great condition.

They were coming here to get heart transplants or have medical studies done as they die of some rare condition. 

A land contract is similar to a mortgage except title does not transfer until all conditions of the land contract are met.

Whether they agree to a walk through or not, all remaining tenants agree to take responsibility for the condition of the property.

Louis, came across a deal on a older brick house (~1938) in decent condition except that it has no Central AC.

This is not a hard and fast rule, but you can get a feel for various prices based on house conditions.2.

The current use is legal and in compliance with the zoning ordinance in its current condition and occupancy.I am acquiring an FHA loan which is whats making getting the loan approved a tricky one because of the zoning issue.

You'll need the seller to clarify the condition.