Set it aside in a low risk mutual fund or even a standard savings account. 

We are not allowed to say if there is an industry standard as this could be viewed as collusion.

NCREIF (National Council of Real Estate Investment Fiduciaries) is a member-driven, not-for-profit association that improvesprivate real estate investment industry knowledge by providing transparent and consistent data, performance measurement,analytics, standards and education.

If they are not managing it to your standards, hire a different property manager and let them manage it.

Standard real estate practices.

The bottom floor is a permanent STR.At this point, living on the top floor of an STR no longer fits my life and while it has been somewhat profitable depending on the month, I can no longer handle the hassle of management and would be taking a loss if I used a standard airbnb property manager. 

That being said, here’s what I would recommend for a thorough DD process:-Build a plan in advance (setup a spreadsheet, meet with the team, etc)-be prepared to take a lot of pictures -document notes with each room (we use notes on Apple and share it with the team)-align the team on standardizing information (example: what does “bad” mean, what does “okay” mean, etc - everyone looks at things differently and you want to make sure the notes are accurate during your debrief)-bring in professionals for things you can see, like sewer lines hope this short list helps! 

Is there a standard amount or is it tailored to the project ?    

I generally avoid wholesalers because my experience has been that they are unwilling to use a standard purchase agreement that is fair to both the buyer and seller and they do 'shady' stuff.

Here is an article that discusses it somewhat. https://www.parealtors.org/blog/appraisal-changes-coming-for...So, some finished spaces are not not counted as part of the GLA based on a standard, which is fine.