They need the help more than VRBO. 

Is it as simple as getting the site designed and engineered for the footprint, cleared and graded (all of which I am comfortable with), and then hiring a GC to build the building?

They could self manage for several years, using the rental income, until the next phase of their retirement.If they have a decent amount of financial discipline, they may want to get a HELOC now before they build to get the most favorable rate.

To become a true business owner or investor, you need to leverage your time through others.

Quote from @Kwanza Price: Thanks Chelsea for your reply.I mostly wanted to understand what the experience was like and if you have any advice for setting up an LLC/IRA?

Gives you time to go do more deals and get more contracts accepted for the next one. 

The industry continues to see consolidation, with private equity-backed firms actively acquiring, albeit at a slightly slower pace than the frenzy a few years back.

If a landlord plans to hold the property for a while, we always recommend an annual lease, ending to align with the summer leading lesson, or staggered with their other leases depending on the situation.  

Steps: you go under contact with the owner of the property, you assign the purchase and sale agreement to the end buyer, the end buyer closes, and you get paid the difference between the agreed-upon price between you and the owner and the intended purchase price of the end buyer. 

Can the agent provide comps?