Am I understanding your question properly if I word it like this?
How do I take money from the owner of land?
I'm not too familiar with the rules of monopoly but you will need more information about the property to be able to tell if a player owns it or not (unless standing on the same spot is enough to own it).
Maybe add another field to your "property" class
this.ownedBy = playerName
or something along those lines
Then perform a loop on the "Propertys" array:
for prop in properties: if (prop.ownedBy == player1): player1.money-=5 if (prop.ownedBy == player2): player2.money-=5
Also those are interesting names for some of your projects 😂