200 Percent Rule Strategy
The three-property rule is the default most Illinois investors reach for first, but it caps the identification list at exactly three addresses regardless of value. The 200-percent rule removes that count limit entirely: an exchanger can name as many Illinois replacement properties as they want, as long as the combined fair market value of everything on the list does not exceed twice the value of the relinquished property. That extra room matters in a state where good candidates are spread across very different submarkets.
Why Illinois Investors Reach for This Rule
An investor selling a single Chicagoland industrial building for eight million dollars might want to identify a Will County distribution center, a DuPage flex building, and a Rockford manufacturing property as backups in case financing or diligence knocks one candidate out. That is already four properties if you count a downstate land parcel as a fallback, which the three-property rule would not allow. The 200-percent rule lets that same Illinois investor build a real backup list instead of betting everything on one deal closing cleanly.
It also suits exchangers diversifying out of a single large Illinois asset into several smaller ones, since the value cap is measured in aggregate rather than per property, which gives an Illinois exchanger more flexibility to spread risk across Chicagoland and downstate holdings at once.
The Math Behind the Cap
- Add up the fair market value of every property identified within the 45-day window
- Compare that total against 200 percent of the relinquished property's sale price
- Drop or revise the list before day 45 if the total is running over the cap
- Confirm final identified values with the qualified intermediary before the window closes
- Keep documentation of each property's value basis in case the IRS ever asks
Where Illinois Investors Get This Wrong
The most common mistake we see is treating asking price as fair market value when the two can be meaningfully different, particularly on downstate Illinois farmland where comparable sales data is thinner than in Cook County or the collar counties. An identification list that looks safely under the 200-percent cap using asking prices can be over the line once a real appraisal or broker opinion of value comes back. We build in a cushion for our Illinois clients rather than identifying right up to the mathematical limit, since a valuation surprise late in the window can disqualify an otherwise solid exchange.
Combining This Rule With a Realistic Illinois Search
A useful 200-percent list usually mixes property types deliberately rather than naming five nearly identical warehouses along I-80. We tend to see stronger Illinois lists that pair an industrial candidate near O'Hare with a multifamily property in the collar counties and a DST allocation as a lower-effort backup, giving the exchanger real optionality if the primary deal falls through during due diligence. That mix also spreads exposure across different Illinois property tax environments, which matters more in Cook County than it does downstate.
Keeping the List Honest as Values Move
Property values do not sit still for 45 days, and a candidate that looked comfortably under the cap in week one can drift closer to the line by week four if a competing buyer bids up the price or an appraisal comes in higher than expected. We recheck the running total against the 200-percent cap every time a candidate's terms change, rather than assuming the math from the first week still holds by the time the Illinois identification notice actually gets filed. This matters more in tighter Chicagoland submarkets, where a hot listing can move price meaningfully in a matter of days, than it does on a downstate parcel that has been sitting with the same asking price for months.
Say an Illinois investor sells a Naperville office building for six million dollars. Under the 200-percent rule, the combined identified list can go up to twelve million in fair market value, which is enough room to name a Will County industrial building, a Rockford manufacturing property, a downstate multifamily asset, and a DST allocation all at once. The three-property rule would have forced that same investor to drop one candidate before ever getting to due diligence, even if every property on the list was a reasonable fit for the exchange.
Common 1031 Exchange Questions
What happens if the identified properties exceed the 200-percent cap?
If the combined value of everything identified exceeds twice the relinquished property's value and the investor does not acquire at least 95 percent of what was listed, the entire identification can be disqualified, and the disqualification is not limited to the excess amount.
Can the identification list be changed after day 45?
No. Once the 45-day window closes, the list is locked, which is why we recommend confirming values and finalizing the list with a few days of buffer rather than filing on the deadline itself.
Is the 200-percent rule better than the three-property rule for Illinois investors?
It depends on the exchange. The 200-percent rule suits investors who want more than three backup candidates or who are diversifying into several smaller properties; the three-property rule is simpler when only a handful of strong candidates exist.
Does the 200-percent rule apply to DST allocations the same way?
Yes, a DST interest is valued like any other identified replacement property for purposes of the aggregate cap, so it needs to be counted in the running total along with any direct real estate on the list.
Who determines fair market value for the 200-percent calculation?
Typically a broker opinion of value or appraisal, and we recommend investors lean on a real valuation rather than list price, especially for downstate Illinois parcels where comparable sales are harder to find.
