I dont recall that when I sold in Cook county a few years back maybe I just did not take note of it since I am used to it on all my CA deals.

Look for cracks in the foundation, walls, or ceilings, as these may suggest settling or shifting.Additionally, keep an eye out for pest infestations, particularly termites or carpenter ants, which can cause significant damage to wooden structures.Lastly, be aware of environmental concerns such as radon levels and underground oil tanks, which can pose health risks.Having a qualified home inspector conduct a thorough evaluation is essential.

When they cook, I smell it, and vice versa. 

Sounds like too many cooks in the kitchen, and no solid systems or policies in place, along with different menus. 

If you can't cook food in it, it's not a "unit."

That's a recipe for cooking with gasoline!!!

Quote from @Ethan Cooke: @Anibal Mijangos - Rental arbitrage is a great business wherever you can find below-market rental units and favorable STR regulations in strong Airbnb markets. 

Kind of like raising earthworms or Ostriches for skin care oil.  

If you are buying from a major oil company, their contracts are extremely complex.

@Jon Haney and if you have heating or propane oil delivery you can show charges for the fuel and the last fill.