Typically when you have this many changes on a purchase contract there is an issue with the buyers qualification.

Some cases show 2 years as investment qualification.  

While they may not qualify initially the contract can be used for qualification so long as qualifying ratios aren't over 50%.

I think someone might have come right out and called me a fraud (or worse) now that I think of it - and they were more right than wrong to do so.Since this deal is dead, the thing to do moving forward is to get a pre-qualification letter from your friendly neighborhood lender (which should usually match the amount of the offer you're going to make on the property.)

You do not meet the qualifications". 

The hiring of a lawyer is an important decision and you should carefully evaluate the education, qualifications and experience of a lawyer before engaging him/her/their services.  

I specially use 2 ratios for income qualification similar to mortgage qualification.

That company most likely needs to have certain qualifications/certifications that says they know how to do what they say they do.  

Also find out how much rent they will allow as contribution to the monthly payment qualification....let's say you buy a 4plex...each unit rents for $1000/month...so 3 of the units are $3000/month, they may want those tenants to have 6 months of rental history or only give you 75% of the $3000 in your qualifications.   

Some lenders will not lend on rural residences depending on their location, so keep that in mind and don't let a lender string you along for 30 days only to find that out at the end...An SBA loan is also a possibility depending on farm type, your qualifications, and the price.