The plan administrator has no choice. The funds must be paid as designated. Reformation at the trust level is up to her counsel and the trust's counsel and is not a plan level question.
John H.W. Cole, Esq.
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I have an officer, partner, or member sign off on the allocations and this is sent to the trustee. My plan document states this as the way to handle directions, and the IRS blessed the document.
The short term solution is to obtain a proper valuation of the land and distribute a fractional interest to the other participant. Then, the dentist can buy it from her, and she can roll it over if she wants to.