The Historic Preservation Alliance appears to be focused on historic buildings in the Wichita area. Their activities appear to revolve around saving historic buildings from development and touring historic places. They have a newsletter and a Facebook page. A person (ok, I) could waste some time looking through their Then and Now section, which adds useful notes to the then and now pictures.
There is no mention of an archives on the website, but there is a list of local structures, sculptures, districts and archaeological sites that have been listed on local, state and national registers of historic places -- this list includes photos and links to the registration applications, which includes a history of the site and a discussion of why it is significant. For example, the application for Calvary Baptist Church includes a chronological history of the building, a thorough architectural description, and brief history of the Exodusters who founded it and the growth of the black community in Wichita, and a bibliography of sources.
If you are lucky enough to find a tie to one of these buildings, this looks to be a good resource for additional information. I expect that the HPA Facebook page might be a good place for queries about old Wichita buildings, although the page is brand spanking new and might not have many readers for a while.