I cannot remember or find posts about why old buildings like the Fiendish Consigner & Pawnbroker, Dwarf Shop, Human Medium Trade Center and probably a few others.. are no longer available to be built on our plots.
Perhaps they were lag inducing, badly coded, too big for the small plots we had way back then or any other number of reasons..... but it would be really neat if they could be "fixed" and sneak their way back into the game. They don't need to fulfill their former function and contain the NPCs they once had, just the opportunity to build them again and be seen by all is enough for me.