There are at least 7, perhaps 8 individual property owners at the summit of Mt Washington.
The Cog Railway, The Auto Road, NH State Parks, Dartmouth College ( I believe there are 2 parcels for Dartmouth, one as Outing Club and one as Education and Research), Yankee Communications, Mount Washington Observatory and WMTW.
USFS ..... I'm don't think they OWN anything at the summit, but they certainly have obtained rights of way and other permissions from all the other ownership interests.
I'm not totally up to speed on the new ( under construction) electrical service to the summit to replace the generator array that was burned to a crisp, but I believe that was all handled as rights of way, not as land purchased.
Dartmouth would like to sell their 2 parcels, there will be long-term haggling over that. Any changes in that regard may not even happen in our lifetime. Imagine the title search to the early 1800's? Rights of Way? Surveying?
As I understand the history, The Cog, the Auto Road and Dartmouth College were the first three granted land ownership, and I don't absolutely know the orders of magnitude or all the exact dates. All three of them predate the Weeks Act of 1911 ( which allowed creation of the National Forest System and the US Forest Service under the auspices of the US Dept of Agriculture).
As far as public perception goes, there is not a widespread understanding that private property issues even exist within the White Mountains National Forest.
Nothing could be further from the truth.
The reason(s) that the Cog couldn't negotiate ski trains to the summit had more to do with NH State Parks than any USFS mandate. NH State Parks owns the summit guest service building and is responsible for services and safety of guests and personnel. The State of NH and NH State Parks refused to accept liability/responsibility for Cog passengers transported to the summit in winter. Issues of fresh water, food, septic treatment capacity, emergency shelter ( perhaps overnight), and staffing the summit of Mt Washington for all possibilities from the NH State parks budget was totally overwhelming.
Breeze