SkyFP began with a hotel to host rooms for his clan as he saw it before on the JKM clan's level "Jumpfun".
The clan JKM started their own tileset and the creative minds of JKM began to build hotel like houses WITHOUT NAMES OR RESERVATIONS. SkyFP began the whole hotel idea and soon everyone began to clone his tileset, and I think the most without even knowing that SkyFP was the origional creator of the whole hotel idea.

Usefull link:
JKM homepage