It is fairly common to write an all cash offer using a hard money loan to finance the purchase. 

You'd think Bigger Pockets would have a thread on the most common questions. ;-) But, since they can’t give legal advice or tax advice, they could have a thread of "stickies".By the way, your's is a question just about everybody has to ask.

With 20% being the common minimum expected if it's purchased for an investment?

That fee goes by many names but "Success" fee is quite common.

I’ve seen both 7 days and 30 days as common “first look” periods here in New York.

In a state that a lender can get a deficiancy judgement if the deal goes through foreclosure the client can get their credit trashed and end up with a big fat judgement against them.. ( state specific).the reason your probably getting buyers that want to do this is because of all the online notoriety currently like Pace Morby who is huge in the space and the legions of students and followers and then to a lesser extent there is BP's own Sub to Guys..

I also plan on developing an ADU to permit 2 + beds 1 bath unit and community improvements such as installing solar panels, specified parking areas, common areas, a community garden (for tenants only), and rehabbing each unit to force appreciation.  

Personally, just add his name to the deed, Pandu Chimata and Joe Blow, as tenants in common....

Is this a residential wood frame building with traditional single or double hung windows or is this a condo building with aluminum windowsI assume you already confirmed the windows are a common element

That is a super common scenario.