With the announcement of the upcoming update, a reasonable question is "where in the mansion will they add the new Art Studio room?"
Well there's been a door, hidden under an aptly named prop in the second basement level that we've somehow overlooked until now.
(w/thx to @rollschuh2282)
The current GTA Online mansion interior basement, where there is a segment of wall and a bench.
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That same area of the mansion interior basement, with the access blocker wall/bench removed, revealing a door.
