Around the main room, there's a booth supplied by the plothole and a sign above it written in inky-black katakana that roughly translates to:
"Help Wanted for Building, wages will be discussed"
To those that barely know Japanese, you can merely ask the tiny old woman with the stern face that is sitting at the booth.
Genkai, for all her talents, doesn't know the first thing about to build a structure. The Temple/Home/Dojo she owned back in her world was given to her by her last master. (And the one she inherited her name from, go figure.) She knew about the upkeep, as the building was older than even her, but alas she didn't know how it was made.
The Old Huntress figured it was time she found a place of own in this realm, while she has gotten used to the magic that surrounds this mansion. She never could get used to her small room and the various craziness that goes on in this place. (Also, is kind of a jerk. As Muraki, The Doctor, and even Titus can tell you.)
She doesn't expect anything like her old home, which was vast, almost like a compound.
Rome wasn't built in a day, you know.
As discussed
here, this is a post for anyone that would like to give the old bitty a helping hand, You could also post to just talk to her but... well. *Points to the jerk part*