I'm pretty sure that the records are garbled. The entry says that the building contains apartments and Leonard Sack's trust is the owner. I think that the the Savopoulos home is a one-family structure, and I would be surprised if it was owned by a trust for the benefit of Leonard Sacks.
Respectfully, I doubt trust is for benefit of Leonard, as one place online (sorry no links)
I saw Leonard listed as trustee.
Maybe scrolling up to my post ~391 would help better explain trust registration.
Also when I skimmed thru 'apartables' (~ website name) entry re this address,
I believe it said that it is single family home, no apartments.
Could have misunderstood.