Commercial purposes means running a business out of the home, like day care, car wash business, landscaping business where you store large commercial vehicles, retail sales, etc.

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

The house sits on a lot that is currently zoned as B3-1 ("Shopping centers, large stores, and retail storefronts, often along major streets.

What if there is meth and dead bodies stored in the walls?

Rustoleum would be great, but there are specific paints you can buy for steel/Iron at your local hardware store.

Furniture and boxes piled up 4' high, narrow aisles through each of the rooms that you can walk through, just barely.  

I am located in Pennsylvania, specifically the Lehigh Valley, and I focus on value-add Multifamily...In case you need them, here are few things to check out as you work your way around the site:For more information on the BRRRR strategy check out David Green'es book: https://www.biggerpockets.com/store/brrrr-ultimateFind and connect with other BP members that are in your area: https://www.biggerpockets.com/search/usersSet up some keyword alerts to notify you when members are discussing something that interests you.

They get here and apparently cant fit furniture upstairs and want to go somewhere else.

No water-filled furniture is permitted without our written permission.

Use the inspection to learn what needs to be done, not only what the inspector checks but everything in the place - furniture, small appliances, silverware, pots, pans, everything. 3.