My present advice, on Aug. 18, 2017 at 12:32 p.m., advice which is subject to change with my mood, is that subsequent to my death you file an estate tax return, that you pay as estate tax the sum of $10,000.- or the amount of estate tax due on the liquid assets, whichever is greater, and that you include with the estate tax return documentation of all presumably non-taxable transfers of beneficial interest in real estate to which I have been a party. You should, in anticipation, calculate the taxes (and penalties) for which my estate would be liable if ALL the presumably tax exempt real estate beneficial interest transfers were deemed to be taxable.  You have, of course, the option of securing the opinion of an estate tax lawyer who might advise you NOT to make these voluntary disclosures.  Whether you accept or do not accept that advice, would obviously be a difficult decision.

If Laura survives you, then when the lawyer she hires settles your estate, and the Dept of Revenue will not expect an estate tax return to be filed, because transfers to a surviving spouse are not taxable.  

The real estate trusts will require consideration only if and when the property is to be sold (or mortgaged), at which time the the applicable trust will require interpretation which will be made by the real estate agent, or by a lawyer representing the purchaser. Hypothetically adjudication by the Land Court might be required to resolve uncertainties, and in consequence of an adverse decision, (severe) penalties for failure to file and pay estate tax might be imposed. 

Arguably real estate held in trust can be transferred by sale of (all) shares of beneficial interest to the new owner(s) and by transfer of the trusteeship to a successor trustee of the new owners' choice. Inasmuch as only the change of trustees would be recorded with the deeds, while the transfer of shares of beneficial interest would remain private.  Ordinarily, when the owner of real estate dies, a automatic lien is placed on the real estate, a lien which is released only after estate tax payments, if any, have been satisfied. Such a lien, however, would not be triggered by a change of trustees. Given that real estate trusts are very common, there must be formal legal procedures applicable to such transfers. I have not investigated, and I don't know what they are.