The Harris Center for Mental Health and IDD ("The Harris Center") is accepting Proposals from. Contractors for the following construction project.The Department is issuing this RFP to engage a DesignBuilder to modernize C.W. Harris. There is no cost to register as a supplier. Fill out and return to the Harris County Purchasing Department ONE (1) complete proposal form in an appropriately sized envelope or box. Harris County , TX is looking to buy goods and services. Discover all bid opportunities, RFPs, and government contracts with Harris County.