This, in turn, allows for higher rental rates or quicker sales, directly impacting the ROI.I could remember when an investor purchased an old, three-story commercial building at  a bustling downtown area.

How to track potential growth in an area to see if a lot is viable for purchase and building spec homes on etc. 

A seller can not sign away his rights in a purchase or any other document.

Therefore you have to rely on contract, if its a new build, make sure its in the Purchase Agreement.Why?

Quote from @Cody Lewis: My wife and I recently purchased our first STR.

I'm looking at purchasing a small multi-family rental property in the Allentown or Philadelphia area, and I plan to use the BRRRR strategy.I'm struggling with the best way to analyze potential properties to ensure a solid ARV and would love any advice on effective tools or methods you use.

I would make sure a bundle of rights for ownership are available individually, per unit of course, then worry about warranty and purchase options.

It is possible to get 90% of your purchase price and 100% rehab funded as a first timer in 1-4 units.  

@Jerry Velezif a property is owned outright with no mortgages, debts or liens on it, then it can (potentially) be purchased on seller financing. 

So I want purchase it as my first rental property it's going to need rennovations for sure not terrible shape just older rancher home.