City planning staff presented a planning commission recommendation to amend Mercer Island’s comprehensive plan to meet a Growth Management Act hearings board order, proposing upzones in the town center and adjacent multifamily areas, a station subarea plan and a 10% inclusionary housing requirement at 50% AMI with a fee-in-lieu option.

After public comment and staff presentation, the council amended Ordinance 267 to require 120 days' notice for rent increases exceeding a cumulative 3% in any 12-month period and scheduled a second reading for June 16; relocation assistance remains capped at $2,000.

After a consultant presentation showing a deficit concentrated at the lowest affordability levels, the Mercer Island City Council voted unanimously to pursue a phased up‑zone scenario for the town center and adjacent multifamily zones and to open a public feedback period on a draft station‑area boundary.

Mercer Island authorized $440,600 to ARCH's East King County housing trust fund for a set of projects ARCH recommended; ARCH said awards will help create or preserve over 500 units across five cities and explained grant vs contingent-loan tradeoffs.

Planning Commission holds public hearing to conclude review of housing code amendments.

Homeowner calls for changes to parking and floor area rules for ADUs in city plans.

Planning Commission alters housing draft, placing substantive amendments in a future review parking lot.

Council discusses ordinance allowing multiple accessory dwelling units and new middle housing types.