They had an appraiser attend the house and said there was no issues on their end.

I've already spent money to have an appraisal and some other various expenses and am wondering if there is a way I can keep him from selling to someone else or if a court could possibly force him to sell to me? 

My challenge here is that land value has a lot to do with appraisal right?

But I wanted to know what people have found in regards to whether you get your money back with an appraisal and ultimate listing price?

The reports are 40-90 pages long and go through the entire house in great detail.Get an appraisal.

He would write me a check for half of the difference of his all in cost and appraised value.

I own A 4 plex.. 2bed/ 2 bath washer and dryer no hoa about 7 mins west of Summerlin paid 370k bac kin feb 2019 ( that was considered high compared to the rest of the areas I was looking in ) Put about 15k into it. it appraised for 430k this month collect about $3250/ month in rents. there is still opportunity and good things going on in this market, just might be harder to find. inventory for mfh now is very tight and expensive.

I have calculated a ball park ARV based on Zillow comps and reading my appraisal of the home before remodel and applying methods the appraiser used.

I know many HOA's won't release documentation to a buyer purchasing within the community until after appraisal and inspection of a property are complete- and then, I'm not quite sure how clear their books may be or how strong of a predictor they would provide in your estimations of future special assessments. 

Last appraisal was 58k in 2015.Thanks in advance.Calvin Wellington