Actually there's a huge anount of work on this, including on how to build smart, efficient, economical, high performing buildings that are less likely to get sick in the first place. (How do I know? we help people do it.)
PS: See, for example, http://www.ciwmb.ca.gov/greenbuilding/Design/CostIssues.htm#Cost&Benefit, as well as our site at http://www.natlogic.com
If you're in the Bay Area, come hear Natural Logic VP Bill Reed speak about "regenerative design" 7pm, 12/11 at the Genentech Lecture Hall UCSF Mission Bay Campus.