Of course if you own those properties under one LLC you can totally do that and you are protected but it is the best to monitor on each property's performance as an investor and most of the softwares are not built that way. 

Then I would do some quick cosmetic improvements, rent the other office, and turn around and SELL the whole building, advertising it as 100% occupied with a nice big cap rate and 5+ years to go on the leases.

The Checkbook IRA owned by an LLC seems to give you the most freedom and certainly the more exposure to the IRS if you perform a "Prohibited Action". 

@Blake Edwards I don't care if they fund control , I just want the money for improvements, and acquisition of other properties. 

I handled all repairs,diagnosed existing problems, performed all duties in the remodeling/repair.

You should not sell your property until you have performed complete due diligence on one or two potential replacement properties to complete your 1031 exchange.

If the buyer does not show up / perform at closing that's a breach of contract... you keep their deposit and re-list the properties.

Investors and companies buy other companies (or properties), improve operations, and then leverage that business to buy and repeat. 

Notice to Buyer to Perform to release all contingencies, return all of the docs, including 2 addendums. 

As far as valuation goes, let's make some assumptions of how the park could perform once you fill it up (assuming your rent survey proves there is enough demand).