Pure speculation:
Although I cannot cite a source, I believe that the townhouse in which BK lived was selected for her and it was not the home in which WH lived. I say this because in the reality series The Houstons: On Our Own, much was made of the discomfort (for lack of a better word) that BK felt while remaining in that home after the death of her Mother. At that point, her aunt Pat found and decorated the apartment into which BK and NG moved (separate bedrooms, at the time). I just figure that after they'd been evicted from the apartment, WH's home might have been sold and/or BK would not want to return to it, and so another residence was purchased.
I would like to think that the townhouse was purchased with undistributed funds from the testamentary trust rather than from BK's 10% share. OTOH, it may well have been leased. Who knows?
Also, to add, I doubt that WH would have lived in a row house type of development. Again, I could most certainly be wrong.
Just musing...
~jmo~