There was a library in the original courtyard... but it was not the product of the rules, just a temporary storage for forbidden books and the book collection.
At that time, the Beast God Sect needed a place to store their Taboo Books, so they used a room in the bank building to create a temporary library.
Lu Ping'an originally thought that even a Rule-level Building would just add another floor to the bank headquarters, like the previous "Reception Room" and "Transaction Counter," but then...
"Boom!"
A huge black building complex slowly rose from the ground.
Its main body was a semi-circular core building, surrounded by distinctly pillar-shaped buildings, one layer after another, one building next to the other.
Forget about fitting it into the bank building, just by glancing at it, Lu Ping'an noticed that it was much bigger than the bank building and could probably fit the bank building into its main structure.
