We just canceled a contract on a home built in 1910 for a plethora of issues including windows, roof, nesting animals in the attic, deck about to fall apart, Garage roof unable to inspect - looked terrible from outside, sagging gutters, not-obvious water intrusion, sagging ceilings, outdated electrical.Get a home inspection.

The rehab consisted of replacing the roof, changing the floor, doing a new kitchen, updating bathroom vanities, and painting the entire house.

The units are small enough for window units and I'm not interested in a huge replacement cost for the old HVAC to cool and heat ducting rather than living space.

Checked made videos looks like gone as nothing UB living area, kitchen left bedroom furniture and mattress only.

Rehabs range from a quick kitchen/bath/flooring remodel to a full gut. 

Renovating 2 bathroomsRenovating a Living RoomRenovating a Kitchen Lessons learned?

You HAVE to gain the knowledge or pay someone to do it for you until you can.And don't just drive by, you can always run around and look in windows.

If it is rooms with shared kitchens or baths it probably falls into the boarding house zoning requirements.

Keep that in mind when thinking about the exit strategy.You mentioned flips so I'd probably throw that rule out the window.

But if it's in the adhesive of a  floor tile or in the sealant of a window.