Now that we have established a site we begun doing research to create some precedence in downtown design guidelines. I have found some literature on a variety of cities from around the country including Los Angeles CA, Austin TX, and Seattle WA.
http://www.urbandesignla.com/downtown_guidelines.htm - Los Angeles, CA
http://www.ci.austin.tx.us/downtown/designguidelines.htm - Austin, TX
http://www.seattle.gov/DPD/Planning/Design_Review_Program/Applicant_s_Toolbox/Design_Guidelines/default.asp - Seattle, WA