How big is the mansion of a great Duke and city Lord?

the city Lord's mansion is a huge ancient castle. The whole top of the mountain can be said to be the scope of the city Lord's mansion. The actual area of the castle can't be calculated by Lao Zhu, but the living room of the castle has more than 500 square meters. The ground is covered with top-grade Bols carpet, and there is a huge magic lamp polished with light magic crystal on the top. You can imagine that at night The city Lord's mansion must be the brightest place of the whole aransol.

several flowerpots are planted...