Some have juiced that up too with all kind of party rental items. 

Gaps in insurance coverage can also occur due to confusion regarding the proper insured parties, and transaction costs may also be higher if involved parties do not have experience with the series LLC structure.

The unique part is that the duplex is in the city and is on a huge corner lot that is 1/3 of an acre so could potentially hold another structure and the sale also comes with the neighboring lot that is smaller but is also large enough to build a structure.  

I just learned this might be an issue due to related party.

I wouldn't rely too much on airdna or any other similar third party.  

For brevity's sake, I understand the merit of seller's not paying professionals to negotiate against them and I am a proponent of brokers having greater flexibility and influence on compensation allocated, as it provides all parties greater chance of compromise. 

I just created an addendum to the lease that all parties had to sign.

You must use the services of an unrelated 3rd party called the qualified intermediary. 

I've worked exclusively with builders on for-sale subdivisions throughout Southern CA for the past ~20 years (thousands of new homes) and cannot think of a single time one of my builder-clients has retraded on price after a third-party inspector toured on behalf of a buyer.

If it’s a chattel filing with the state, the foreclosure would not affect the secured party’s interest… they could still repossess the equipment.