I can t see this being worth more than 500 to 600k.. best case. 

Jon Your properties sound very nice and the ss would probably compliment the style very well.  

You have to check the installation manual for the furnace for this; there is a limit to how many elbows and how long of a pipe you can use.Some manufacturers have an outside vent cap (example:http://www.myhvacparts.com/store/media/products/ba... ) that has sort of a coarse screen or some bars over the pipe opening, but not so fine that they're likely to freeze.There is another style, called a "concentric vent", that has one pipe running inside the other, so you only need one hole in the wall. 

This is just my "style" but I'd get as good as I can get without being ridiculous.

As the Supreme Court has recognized, “[t]he mere fact that a man has been arrested has very little, if any, probative value in showing that he has engaged in any misconduct.

Now that you have worked on different payment arrangement styles you have opened yourself up to issues.If it was they pay each month and it's late after the 5th then it makes it simple.

I am not saying that we need to put them in jail for years, unless they are repeat offenders that is lol. like @Richard Dunlop said though, you would be arrested before leaving the parking lot for stealing a meal or a t-shirt from a store.

Do the building codes require you to install greater wind mitigation style roofs?  

It still uses old style interfaces.

They are all wood, there are many styles, and they cost less than the big box ones.