A manor pruchased by Rhaenys to use as a temporary base of operations to plan her revenge on the Usurper and his allies, and other matters such as other Targaryen pretenders, assembling support for her claim, and the like. It is located in one of the Free Cities, but very few people know which one it is in.( Ie, no posting you automatically find it.). It is guarded by Targaryen loyalists who assisted in the escape from Westeros, and anyone who tries to meet with the residents is disarmed and blindfolded before being brought into the Manor past it's fence as to prevent anyone from tipping off the Usurper as to where Rhaenys is. Guards would always be present in the meetings as well.
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The Castle of House Velaryon, owned by the House for numerous decades, potentially since the time of Aegon I.