Private company
Who owns Residential Tower Developer LLC (Hub50House)
One company in the researched set discloses a stake in Residential Tower Developer LLC (Hub50House), worth $33m between them. Residential Tower Developer LLC (Hub50House) is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
What this is
The single asset Delaware venture that developed Hub50House, the 38 storey, roughly 440 unit apartment tower at 50 Causeway Street in Boston's West End that opened in 2019 as the residential component of The Hub on Causeway above North Station, and which is named only in BXP's own SEC filings and subsidiary lists.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- BXP, Inc. (formerly Boston Properties), as of 30 Jun 2026. 50% joint venture interest in the residential tower (Hub50House) at the Hub on Causeway. Carrying value $33,167 thousand at 6/30/2026 vs $33,942 thousand at 12/31/2025. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Residential Tower Developer LLC (Hub50House) where a holder stated one, and are missing where no holder did.