We drove out to the property which was very secluded, way off the beaten path, after a recent snow required 4 wheel drive to access. 

Best advice is Not all foreclosures sell for a good deal, and most will not qualify for traditional financing, so if you are serious about buying an REO make sure you either have cash, construction financing, or commercial type loan at your disposal.

Ranging from rental multi-family homes as well as commercial properties.

What is the recommended due diligence period of a commercial property?

This is also going to be our first deal so any advice would be greatly appreciated.I do that all the time with commercial (5+).

Best bet would be to buy below market value of the dirt and flip to a developer to build homes or commercial building.

You typically get access to the gym, tennis courts, and dinning facilities. 

New hanging ceilings give them access to the upper walls to run wire on the upper floors and first floor is easy because of the basement access. 

To give a little background, my aim is to focus mainly on BRRRR investing using what I've heard in the podcasts referred to as the "Stack" method: starting with SFH and working my way to small MFH and eventually Commercial MFH. 

Some tenants won't have access to direct deposit so they would have to either give cash or check.