As for endotoxins, we got a clean bill of health with levels well within acceptable range and very close to ambient outdoor air (the environmental consultant actually defined it as "excellent").  

A modest but nice modular and let the discounts on the home and ,from what I understand, the way you cost consciously build the modular appreciate.

Also see the "Home Buying Process By State" section on this page, which has an entry for each state and discusses related issues that aren't about the closing per-se (such as customs around wells, heating fuel, environmental, pests, etc.)

In NJ you cannot evict or remove your tenants to do renovations unless the house has an structural or environmental issue that could jeopardize the tenants lives, health or similar. 

(Cleared environmental Phase I, New survey, and are at site plan stage and requesting a letter of commitment to permit from the governing body now).

One major thing to look for is structural issues as well as the other items listed, also lead based paint, environmental issues etc.

By shouldering this responsibility, tenants become more conscious of their usage and may work together to use less.4.

a phase one environmental study would be important

Repurposing underutilized structures is more environmentally sustainable than demolition.

@Justin Cooke If you can afford to do the subdivision map now, that would probably be the smart move. the reason being, you have no idea what new environmental laws, or other constraints could be put on the property in the future that would make it more expensive to develop.