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Tempe commissioners press for stronger protections in draft downtown historic core plan
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Summary
Commissioners and preservation advocates urged tighter design guidelines and height limits for Mill Avenue and the downtown core, proposing stronger frontage-to-alley protections and incentive tools such as transfer of development rights to steer density away from vulnerable historic parcels.
Tempe's Historic Preservation Commission and foundation used a joint meeting to critique the draft Downtown Historic Core plan, urging clearer, enforceable protections to prevent new development from overwhelming low-rise historic buildings.
Commissioner Mister Williams framed the plan as a policy outgrowth of the city's general plan and warned of gaps between policy and enforceable rules. "This plan is an outgrowth of the 2050 general plan," he said, noting that policy documents guide decisions but do not carry the same legal weight as zoning or code. Several commissioners argued that placing the core plan into the general plan as a voted element would make substantive future changes harder to enact without public approval.
Speakers flagged specific language in the draft that would allow tall buildings in portions of the core. "We've got draft guidelines in here with heights of up to a 100 feet," a commissioner said, raising concern that towers placed behind preserved Mill Avenue frontages would sideline low-rise historic buildings. Commissioners urged that height and massing guidance treat Mill Avenue frontage and the blocks behind it as a continuous zone (alley to alley) to prevent high-rise backfill from undermining historic streetscapes.
Staff and commissioners discussed practical tools to preserve character while enabling development. Zach, planning staff, described transfer-of-development-rights incentives and negotiated development-disposition agreements as ways to move density to appropriate sites. "You can take the density and intensity of that 10-story building ... and move that elsewhere in the district," Zach said, summarizing an incentive approach that shifts bulk away from sensitive parcels while preserving overall capacity.
Commissioners also discussed public control options: owners' consent for districts, the difficulty of securing neighborhood-level votes for mandatory districts, and the reality that national-register listing does not prevent demolition by a private owner. One commissioner urged exploring measures the public could support at the ballot, noting that a general-plan element adopted by voters would require a public vote to change.
The meeting included an update about an active redevelopment project that touches historic structures: staff reported ongoing negotiations with a developer over rehabilitation responsibilities for the Hayden House and related mill-site work and said the city has more than $300,000 available for short-term stabilization if required while the development agreement proceeds.
What happens next: staff will extend stakeholder outreach, schedule in-person sessions with the consultant, and return a revised draft for the commission and Development Review Commission to review; commissioners asked staff for a list of specific plan sections and phrases of concern so the public can be mobilized for comment.
