I am seeking research reports and case studies involving the effect
that airport noise has on the marketability of office space.

Hello stuartkearns-ga,

http://www.airportnoisereport.com/index.html
Welcome to Airport Noise Report, the only newsletter published
exclusively for those interested in the complex topic of aircraft
noise.
See the Noise Related Links page for additional organizations and
resources.

http://www.realestatedamages.com/Articles/Randy/AirportNoise.pdf
The Impact of Airport Noise on Residential Real Estate

http://www.realestatedamages.com/index.htm
The real estate consulting firm of Bell Anderson & Sanders LLC, hosts
this site.  We specialize in measuring the economic impact of
detrimental conditions on real estate values.  Our clients include
major oil companies, utility companies,   governmental agencies, major
corporations and property owners.

Good luck.
czh