The insides of the auction house were nowhere as grand as its exterior. That, however, by no means meant it wasn't representative.
No.
If the exterior of the auction house was set to overwhelm and awe anyone who laid their eyes on it, then its interior was kept in a much more cozy, homely, yet still perfectly rich manner.
In place of a huge open area displaying the full size of the domed cube from within, the building's insides were all covered up and split into parts, the biggest one of which had to be the entry hall that occupied roughly a quarter of the building's floor space.
Contrary to Theo's expectations, the inner side of the building's impressive dome couldn't be seen either, perfectly covered up with a simple roof just a little bit higher than what one would expect from a standard residential building, implying the whole place actually served a much more practical role than its exterior would suggest.