The stupidest idea indeed, but while watching this footage of a great music room

the thought occurred that with enough debt, a lion could probably build a room like that though certainly not the whole mansion.  Building a room like that could be a lion's ultimate goal in life.

Then the thought occurred that it isn't the best music room a lion ever had.  The best music room a lion ever had now lies in ruins.

It wasn't suitable for the orchestra it was used for, the roof leaked, but for a pianist on a dry day it was a dream.  Lions always knew their time there would come to an end & to cherish every minute, but never expected it to be eventually demolished.

The idea isn't to rebuild the entire HFAC, but maybe to rebuild a similar sized version of just the 1 room.  It would be a steel building.  The mane difficulty is making the walls oblique to reduce the echos.

The room was 54x42 ft.

It would take a paltry amount of real estate.

The entire building would actually fit on both plots of land.