This is this unit's pro rata share for all 100 units in the building.

The units are separately metered for gas and electric or you bill them pro-rata?  

The only scenario I could see is that you charge them a pro-rata on the time they are in.

Put a clause in contract that if for any reason he does not have the right to sell the property, he agrees to transfer his INTEREST in the property (say it turns out he only owns 1/3 with two other siblings) for the pro-rata share of the agreed price.Basically, if it is important, talk to a lawyer so that your contract actually works, no matter what comes.

Also, all distributions from the business have to be "pro rata" to their ownership interest, which occasionally causes owners issues.LLC: This is one of the most flexible investment vehicles. 

I’m not a CPA but it’s my understanding that as long as you itemize your income/expenses and keep detailed records you can qualify for the section 121 exclusion but it will on a pro rata basis.

Created mortgage and note for the private lenders recorded by the title company at the courthouse, with lenders having pro-rata fractional interest in a 1st lien position against the property, with further collateral in the form a personal guarantee by yours truly.Details (Nitty Gritty!)

So, you can’t 1031She could do a pro-rata 1031. 

Maybe if you own the land with zero debt you may find a builder to build on it and you pay him a "builder fee" and split the "profits" pro-rata based on amount of equity invested. 

My lease has terms about paying a 150% pro rata rent  if he stays beyond the lease term but not sure how I can enforce that either.