The reason being that you get not only the heat loss through the window that has been mentioned, you also get actual air infiltration which increases that energy loss by probably triple.

I have place two timer realesed air fresheners in the hallways and they seemed to help a little.

If you don’t have these kinds of funds available, how do you expect to fix an air conditioner when it breaks or solve a leaky roof issue, or pay the plumber that comes out at 2 in the morning on a Saturday night to stop the flood in your basement?

AC units don't like water, so being open to the air is not good for them.

Yes, NNN is somewhat passive, however the lease renewals typically make landlords blood pressure go up.

I would make sure the new property is one you'd still buy even if the 1031 option didn't exist - it's got to feel like a lot of pressure when you're trying to complete the 1031 on time. 

In a land-locked location exhibiting economic growth pressures, the equity appreciation warrants a complete re-build (the right way) of a 1920 house.

I locate lost heirs to mineral interests for my day job and I am pretty good at finding people but these people seem to have evaporated into thin air.

Whats amazing to me is that most people will spend hours online researching a $500 camera but jump into things like guru scams or time shares worth thousands of dollars on the strength of a high pressure sales presentation.

From a safety and liability standpoint, every old house has mold but it depends on whether it's at a dangerous level (air quality test).