My mailer hit a parcel the county had split into two tax IDs but the GIS still showed as one lot

That parcel split detail is something a lot of operators miss entirely, and the way you worked through it is worth breaking down for anyone reading this thread.

For context: a tax ID (the number a county uses to track a specific parcel for billing purposes) and the actual legal boundary of a piece of land are two different things. Counties can create a new tax ID for a sliver taken through eminent domain (a government's legal right to take private land for public use, usually with payment) without the original owner ever receiving clear notice. The bills just get redistributed across the new IDs, and if the owner only sees a slightly lower total, they may never question it.

The access issue is the part that would have killed this deal outright. An end buyer pricing land for development is pricing it partly on how equipment, utilities, and eventually buyers or tenants get in and out. A county-owned strip along the only access point is not a title defect you negotiate around with a price cut alone. You needed confirmation the county had no plans for that strip before your buyer could close, which is exactly what you got in writing.

Your recommendation to pull the tax ID history on anything near a road project is the practical takeaway here. Most county GIS portals let you search parcel history or at least cross-reference adjoining owner names. If the county shows up as an adjacent owner on anything touching a roadway, that warrants a conversation with the title company before you price the deal, not after you are in a 21-day window.

One thing worth confirming with your title company: whether the county strip could ever revert or be vacated in a way that affects future use. That question may already be settled for this parcel, but it is the kind of thing that shows up in buyer due diligence on resale.

Did your title company flag the split through the chain of title search, or did they catch it another way?

The assumption doing the most work in your original pricing was that one parcel boundary on GIS equals one sellable legal parcel. GIS is a display layer. It pulls from the county's base map, which often lags administrative splits by years, sometimes a decade or more. The auditor's system and the GIS are maintained separately in most counties, and they sync on nobody's schedule.

The risk you did not name here is access by prescription or easement. That county strip now controls ingress to 9.8 acres. Your buyer confirmed the county has no intent to vacate, which protects him for this close. It does not protect whoever he sells or builds on that ground later, because the access situation will surface again in title when he exits. If he is a developer rather than a long-term holder, that downstream title exposure may have been underpriced in your renegotiated assignment fee. Whether that matters to you depends on whether he comes back to you for future deals.

The operational fix for your due diligence checklist is straightforward. Before you price or market anything near a road corridor, pull the auditor's parcel history, not just the current record. Most county auditors maintain a split and merge log, and a direct call asking whether the parcel ID has any associated transactions or administrative actions since original platting will surface this inside fifteen minutes. GIS and the treasurer's tax bill will not tell you. The auditor's records will.

Your instinct at the end of your post is right on the road-project trigger. I would extend it: any parcel adjacent to a ROW boundary, utility corridor, or drainage easement warrants the same check, because administrative acquisitions in those contexts rarely announce themselves on the instruments a seller would think to watch.

What title company are you using, and are they running a full parcel history search as standard or only current-owner chain?