Empty Offices Become Apartments at Record Scale — Reuse Hits Critical Mass

➤ The Signal

• Conversion has crossed from novelty to a structural supply channel.

• Obsolete office is being repriced as multifamily land.

• The math finally works in enough markets to scale.

For years, office-to-residential was a conference-panel idea with a handful of trophy exceptions. The 2026 print ends that framing: a 28% jump and a 4× rise off 2022 is a structural channel, not a curiosity.

The driver is repricing, not nostalgia. Conversions pencil when office values fall far enough that the building trades as residential land plus a structural discount. Cities accelerating the most — Philadelphia, Denver, St. Louis — are precisely where office distress met permitting reform.

For underwriters, this reshapes two sectors at once. It slowly drains obsolete office inventory (supporting surviving office), and it adds housing supply in supply-constrained downtowns — a partial offset to the multifamily delivery cliff forming for 2027.

➤ Implications

Watch reuse-friendly cities outperform on both office stabilization and downtown housing. Construction-cost and floorplate feasibility — not headlines — still gate which buildings actually convert.