Downtown Indianapolis's office market has spent four years shedding assessed value. Our Mile Square commercial recovery report walked through the damage by building class — hybrid work hollowed out occupancy, owners appealed, and assessors marked values down. The open question has always been: what rebuilds the tax base on the other side?
In 2026, the answer is taking physical form. Office buildings are leaving the office market entirely — converting to apartments and hotel rooms — and the assessment math of those conversions is the most important downtown tax story that isn't on a ballot. Two projects show how it works.
The Angi building: 180 apartments and $28.6 million of new AV
The clearest case study is Holladay Property Services' conversion of the former Angi Inc. headquarters at 130 E. Washington Street, on the southern edge of the Mile Square. The plan approved by the city: convert the office building into roughly 180 apartments, supported by a city tax abatement. The project's own filings put the payoff in assessment terms — the conversion is projected to increase the building's assessed value by about $28.6 million.
Pause on that number, because it's the whole thesis in one line. An office building that, as offices, was a depreciating entry on the tax rolls — the kind of asset whose owner files a Form 130 with vacancy evidence every cycle — becomes, as apartments, an asset worth tens of millions more in the assessor's books. The same shell. The same parcel. A different use, and a transformed contribution to the tax base.
Capital Center South: when conversion shows up in the vacancy data
The second signal comes from the market statistics themselves. CBRE's Q1 2026 downtown Indianapolis office figures recorded that Capital Center South's net rentable area decreased by 87,000 square feet — not because space was demolished, but because the tower's top seven floors are converting to hotel suites and exiting the office inventory.
That's the mechanism by which downtown's office vacancy rate eventually heals: not a hiring boom refilling cubicles, but the denominator shrinking. Every conversion pulls competitive square footage out of the market. Hybrid work hasn't reversed — it keeps pushing marginal office buildings toward their highest and best use, which downtown increasingly means housing and hospitality.
How the abatement actually works
Conversions of this scale almost always arrive with a property tax abatement, and the mechanics matter for understanding when the new AV actually hits the rolls. Indiana abatements (IC 6-1.1-12.1) work as a deduction against the new assessed value, phased out over a schedule the council sets — up to ten years:
- The council designates the site an economic revitalization area and approves an abatement schedule.
- In year one, a large share (often all) of the new AV created by the project is deducted from taxation. The pre-existing AV keeps paying tax throughout.
- Each year the deduction percentage steps down, so the project pays tax on a growing share of its new value.
- By the end of the schedule, the full new AV is taxable.
Applied to a project like 130 E. Washington: the roughly $28.6 million of new AV doesn't translate into full tax revenue on day one. It phases in over the abatement term, ramping toward its full contribution. That is still a categorically better trajectory than the alternative — an emptying office building whose AV declines with every appeal cycle. The abatement trades the first years of taxes on new value to bring that value into existence at all. We covered how these schedules wind down — and what happens when owners miss their annual compliance filings — in our abatement phase-out tracker; the same CF-1 compliance machinery applies to residential conversion abatements downtown.
Note
For everyone else's tax bill, conversions cut both ways in the short run. During the abatement years, the new AV contributes little to the levy base while the project consumes city services. After phase-in, it broadens the base — and in a levy-driven system, a broader base spreads the same levy across more value, nudging the tax rate down for everyone else in the taxing district. The benefit is real but deferred. The downtown TIF picture complicates it further: where conversions sit inside TIF allocation areas, the incremental AV flows to TIF before it ever reaches the general base — see our TIF expiration timeline for when that changes.
What conversions mean if you still own downtown office space
If you hold an office building that is not converting, the conversion wave changes your assessment and appeal posture in three concrete ways.
1. Your comp set is shrinking — and getting more honest. Every building that exits office inventory removes a potential comparable. What remains is a cleaner picture of what office-as-office is actually worth downtown. For appeals, the sales that matter are arm's-length office trades — and recent downtown office sales have tended to print at numbers that support lower assessments, not higher. A building that sold for conversion is also powerful evidence: conversion buyers pay for the shell and location, not the office income stream, and that pricing reflects the market's verdict on office use value.
2. Vacancy evidence stays potent — but document the right kind. Assessors look at market-wide vacancy when applying economic obsolescence. As conversions remove square footage, headline vacancy rates will eventually improve, which over time weakens the generic "downtown office is dying" appeal narrative. What stays persuasive is building-specific evidence: your actual rent roll, your actual occupancy, your actual concessions and tenant improvement burn. The income approach — actual NOI capitalized at a market-supported rate — is the strongest tool an office owner has at the PTABOA, and the June 15, 2026 Form 130 deadline for this year's values is days away.
3. Conversion feasibility is itself a valuation argument. If your building's floor plates, window lines, or systems make residential conversion impractical, you own an asset with fewer exit options than the buildings that converted — a genuine functional obsolescence argument. Conversely, if you're holding for a conversion play, remember the assessor values current use and condition as of January 1; speculative future value as apartments is not a basis for a higher office assessment today.
The bigger picture: this is how the recovery happens
Stack the two trends and the trajectory of the downtown tax base comes into focus:
| Force | Direction of office AV | Direction of total downtown AV |
|---|---|---|
| Hybrid-work vacancy and office appeals | Down | Down |
| Apartment/hotel conversions (during abatement) | Removed from office inventory | Flat to slightly up |
| Conversions (post-abatement) | — | Up, materially |
| New residents supporting street retail | Stabilizing | Up |
The Mile Square's assessed value problem was never going to be solved by office demand returning to 2019. It gets solved parcel by parcel, conversion by conversion — $28.6 million here, seven floors there — with abatement schedules determining the lag between groundbreaking and tax-roll impact. Apartment conversions also land in a property class the county has been assessing aggressively: the apartment assessment surge that hit existing complexes means converted units will enter the rolls under cost schedules that have moved sharply upward — good news for the levy base, something for conversion developers to underwrite carefully.
One more wrinkle: converted residential buildings exit the Mile Square EED fee base, since apartments are excluded from the downtown fee unless they opt in. The fee that funds downtown's cleaning and safety ambassadors leans on exactly the property type that's disappearing.
Track it yourself
Every conversion shows up in the public record long before it shows up in skyline photos: rezoning and abatement approvals, then permit activity, then the AV step-change on the parcel. You can watch any downtown parcel's assessed value history, property class changes, and abatement deductions through the AribaTax property lookup — including whether the 130 E. Washington parcel's AV does what the filings project.