I have no firm evidence, but I was always under the impression that the palace and park remained in the Emperor's keeping and that it was borrowed by the Vladimirs and also by Xenia and Sandro for part of their honeymoon.
It does not appear to have been a very large palace... although it appears to have had annexes connected to the main block that are not in any photos here. It is such a shame that the links posted some time ago to the plans of the palace and park are no longer available, I long to see more about this intriguing palace, what with its rather blood thirsty history and Paul Petrovich's apparent obsession with the place and his plans to rename it etc.
I notice from the photographs we see today, the ones of the ruins as well as the old one from the turn of the last century, it appears that the photographs may have been taken by the photographers standing with their backs to the the 'little' lake visible on the map...am I right? I wonder if this was the principal entrance facade or whether it was regarded as a garden front and that the opposing facade, of which we do not have any pictures, was perhaps the principal entrance front instead. I have also noted that their was a belvedere, and wondered if it lit a central hall within the main block of the palace?
If all the scant literature available is accurate, it appears that the palace really was a homogeny of styles, having been worked on by various architects, including Rastreli to Felten, although the facade we see in the photograph appears pretty uniform neoclassical to me! Perhaps Paul had the whole palace demolished and rebuilt?
I have found some tragically haunting contemporary photos, which bring home to one just how dreadful the state of the palace became;-
http://photogoss.spb.ru/index.php-en&ft_fotoropsha.htm