This could really reduce the hourly rate of return from your rental business per hour of your time invested.

And real estate values would have plummeted because of the reduced population.  

Then pad and labor?

What everyone needs are products, services and policy structures designed by real estate investors, for real estate investors and one of those features is a portfolio type master policy, with no location limits, with the ability to insure multiple controlling entities and properties in any stage of renovation, in all 50 states, offering agreed value, special form coverage with theft and vandalism, the ability to actually reduce premiums incrementally by aggregating locations AND do it all on a monthly reporting basis so that you and your CPA can easily see the breakdown in coverage and premium for every location. 

They force you to constantly do specials that reduce your profit margins.

And as for the windows if What Curtis said wont work you can mark out the opening with tape rent a demo saw for a half a day shouldn't cost more than $80 and window and framing about $300 then the rest is just labor digging on the outside.

I have a house that I looking at buying that needs to evaluated so I can determine the cost of repairs and labor.  

I have a house that I looking at buying that needs to evaluated so I can determine the cost of repairs and labor.

that way @Steve Raymond and others may be able to bring you a deal, that you are actually interested to look at....Gerald, Are the rehab you do light,moderate or labor intensive?

I say pick 10,000 immigrant families that want to come to America to invest their money, minds, labor and place them in Detroit for example.