The second largest subseries in Hildt's records is Land Use and Urban Development, reflecting his involvement in these issues. Discussion on Jeannette Williams' Greenbelt Overlay District proposal addresses issues related to preserving Seattle's greenbelts. These issues include open space, yard and setback requirements, lot size, and the clustering of homes in single family zones to encourage contiguous greeenbelt preserves. There is related material in Jeannette Williams' Subject Files. Disposition of the Martha Washington School site is also documented in Hildt's records, although it is more fully explored in other records series. These include Councilmembers Dolores Sibonga and Jeannette Williams Subject Files, the Legislative Department Central Staff records, and Parks Department records.

Of most interest in the Land Use and Urban Development subseries are the files on the Pike Place Market. Especially well documented is Hildt's work with the Pike Place Market Public Development Authority (PDA), the farmers, and craftspeople to forge a compromise. Notes, agendas, and supporting materials are included for the Ad Hoc Advisory Committee of the Pike Market PDA Ordinance Update and for the Pike Place Market PDA Agenda for the 80s Steering Committee. Drafts and discussions of legislation relating to street performers in the Market and opening on Sunday are also included.