That's the first place businesses skimp when trying to cut costs.

Whatever you go for,  I suggest , choose energy efficient windows and door for they would help you cut down 30 percent of your cost !!  

As you scale up, Excel just doesn't cut it. 

I'm not looking for a cut in the profits.

If you make an honest attempt of learning real estate first, you'll do much better than trying to take guru short cuts that go afoul of laws and regulations then end up dealing on the dark side.Good luck :)  

The tenants can still use the spot by placing container plants on top or cutting a whole in the mesh to plant something.

All this means is that as long as you don't pull out more than 4% a year, you probably won't ever dip into your nest egg. 4% of 625k = 25k4% of 750k = 30kSo, if the stock market (or your chosen combination of income generating assets) makes a return of 4% or better, you should be fine to pull that amount out to live on without ever having to cut into that chunk. 

@Tim Herndon thanks a lot, this will cut down my time greatly.  

Measure twice, cut once.If you don't want to do it yourself, check your local glass replacement business - they do screens. 

There is way too much of a prevailing attitude that they'll slap together a deal, take a cut, then "move on down the road" and not be around or care when it blows up on someone.