MIT Mystery Hunt 2020/The Castle

The Castle is the metapuzzle from the Grand Castle round of the 2020 MIT Mystery Hunt. It's a pure meta, with only the following flavortext as additional assistance:

''Penny Park’s castle has an ostentatious, stately, capitalist facade. The flagstones initially look historic, but investigations have yet to pan out—who will handle it from here? ''

Solve Path
Final Answer: