There are a number of other factors that will come into to play but these are the factors that are easily observable to most anyone who is paying attention.

He said that it is severe, but easily remediated.

 @Chayson Descisciolo, This deal ended up falling through before I had an actual solution, but not before my real estate attorney told me that he could easily figure out a structure for that - so next time I run across this I will just go straight to the professional!

And a tenant crying "the landlord stole my security deposit" goes way too easily. 

I know investors can see these just as easily, so shouldn't there be some sort of first-to-the-finish race to tie up these "easy" finds?

So I'm considering these different electric options:1) cadet wall heaters with built-in fan2) plug-in panels (VonHaus 450W Wall Mounted Electric Flat Panel Heater - Paintable Slimline Low Energy Eco Ceramic Space Heater (23.5 x 23.5 x 0.4 inches) https://www.amazon.com/dp/B01LZ3NE3E/ref=cm_sw_r_cp_api_H0Q1ybQHE3DNG)3) convection heater (http://m.homedepot.com/p/Stiebel-Eltron-1000-Watt-120-Volt-Wall-Mounted-Convection-Heater-CNS-100-1-E/206160725)So I'm wondering if you have experience with any of these models or styles.

This should be easily removable when no longer needed.

, yard - may exceed total security deposit which you can't easily recover?)

If you could have easily found out that it was historic and/or already did but ignored it and closed anyway, it might be a hard battle to win.If the seller says the roof is 5 years old and the home inspector says it's 15 and needs to be replaced soon, and you close anyway, would you expect to sue over the roof?

I can pretty easily find a property and be all in at 70-80% arv.