Tucson planners and commissioners clash over scope of middle‑housing rules under state law

City planning staff presented draft code amendments to implement state middle‑housing requirements (referred to in the packet as "house bill 27 21"). The staff package proposed allowing up to four dwelling units on qualifying residential lots inside a defined geography (roughly a one‑mile radius of downtown, with some extensions), standardizing 5‑foot setbacks, new privacy mitigation for two‑story units, reduced minimum lot sizes in certain zones, a one‑space‑per‑unit parking baseline with transit waivers, and new landscaping requirements (one tree per 1,000 sq ft).

At a public hearing Planning Commission discussed the tradeoffs and voted 9‑1 to recommend allowing middle housing citywide, and additionally urged changes to lot‑split and subdivision rules that would permit smaller single‑ownership small‑lot subdivisions to enable more homeownership opportunities. Commissioners and councilmembers noted state preemption questions and flagged Prop 207 (exaction and property‑rights) risk if the city allows a use and later attempts to roll it back; the city attorney warned the council the change could be litigated.

Councilmembers debated whether to start with a larger geography than the narrow one‑mile minimum required by state law, to phase eastward, or to allow citywide implementation. Several councilors stressed design standards must prevent “sea of parking” and poor‑fit mini‑dorm conversions around the university; others pushed for small‑lot subdivision tools that favor homeownership over concentrated rental mini‑dorm developments.

Staff said they will return with refined options prior to the Dec. 16 public hearing, including hybrid geographies (exclude rural residential zones, or expand further east) and a proposed complementary code cleanup package to address subdivision and construction‑defect considerations.