The Tax Boundary and the Building

An opportunity-zone designation can change the tax treatment of a qualifying investment. It does not establish how much building a parcel permits. Compare the same development program on each site, then evaluate the tax treatment separately.

Here is where that rule gets tested. In Dallas County, southeast of downtown Dallas, census tract 93.01 (GEOID 48113009301) is one of the 8,765 tracts designated in the 2017 round. Its east edge is a straight north–south line. Put lot A about 200 m west of that line and lot B about 200 m east of it, roughly 400 m apart. Same program, same price. The lots are hypothetical; the line and the lists are from the record.

The building question comes first because it has an answer. A census tract is a Census Bureau statistical area. The tract file carries no height limit, setback, lot coverage or floor-area ratio, and it doesn’t say which zoning district either lot is in. If A and B share a district, they support the same building to the square foot. If they don’t, the difference comes from the zoning map and would be there with no tract line at all. Either way, the designation adds no floor, no unit and no parking space.

The tax question depends on the date, and the two lists in the record answer it in opposite directions:

• 2017 zones. Lot A is inside tract 93.01. Lot B is outside every 2017 zone in the file.
• Eligible for the 2027 round. Rev. Proc. 2026-14 lists 25,332 tracts as eligible for nomination, effective January 1, 2027. Lot B sits in tract 92.02, which is on the list. Lot A doesn’t: about 98% of tract 93.01’s mapped ground lies outside every eligible tract, even though 91.03, 91.05, 92.02 and 93.04, which border it, are all listed.
• Certified 2027 zones. Not in the record. The repo’s file for them is empty, marked as waiting on an IRS publication.

So lot A’s case rests on the previous round’s list, and lot B’s rests on a list nobody has finished. Start with the exact census tract and the designation applicable to the investment. A tract eligible for nomination is not yet a designated zone: Treasury certification follows nomination. The new designation round takes effect January 1, 2027.

The investment must also meet the applicable fund, property, and timing requirements. IRS transition guidance distinguishes investments made before and after that date. I’m not going to tell you what either lot’s investor would get. That turns on the fund, the gain, the dates and an adviser, and none of it is on a map.

The record has limits, and they matter more than usual here. The 2017 zones are drawn on 2010 Census tracts; the eligibility list is joined to 2020 tracts, so the same tract number can describe different ground. Both layers are simplified for the web, by roughly 110 m and 165 m, which is enough for lots 200 m from a line and useless for a parcel on one. Of the list’s 25,332 rows, 243 didn’t join to a mapped tract, so absence from the map is not proof of absence from the list. The record also holds no tract income or poverty data to look for a reason tract 93.01’s ground is off the new list; that fetch is waiting on a Census API key. A state’s tract count or a historical rural flag cannot establish a project’s qualification or tax savings either. An underwriting decision needs the applicable certified boundary, the parcel’s own location against the unsimplified tract, and the transaction terms.

My call: buy the lot for the building, and treat the tract line as possible upside, not a foundation. If lot A only pencils with a 2017 designation, or lot B only pencils with a 2027 designation nobody has certified, it doesn’t pencil. The building is the same on both sides of the line. The tax boundary has already moved once under these two lots, and the next version isn’t in the record yet.

The building half of the question has its own exploration: what the same land dollar supports across Dallas zoning districts.