Black Forest.
Austria.
Rothschild.
Black Forest in German = Schwarzwald.
Search leads to Austrian born artist Christian Schwarzwald, whose work "Rooms Fulfilled"
(2003) is featured in the Judith Rothschild Foundation Contemporary Drawings Collection:
https:// books.google.de/books?id=Dvx1HD72UYgC&pg=PA247&dq=schwarzwald+rothschild&hl=en&sa=X&ved=0ahUKEwiGsZSL5ZHZAhWKPFAKHV0FCcQQ6AEIPDAD#v=onepage&q=schwarzwald%20rothschild&f=false
The painting was apparently gifted to MOMA: https:// www.moma.org/collection/works/97336?artist_id=28878&locale=de&sov_referrer=artist
If this is connected to the sale of the Rothschild hunting estate in Langau, Austria, the painting might offer a clue as to what went on there.