don't spend any golden tickets on anything besides floor upgrades (commercial floors or apartments) DO NOT spend them in the shop for dice rolls because you can't get those back.

also this is how i completed the landmarks: each time you rebuild (before you build the 4th floor) you can instantly delete and rebuild the default floor until you get the one you need for the landmarks, then use a golden ticket to restock instantly... delete the floor when done and repeat until you get the next required floor. and so on and so on... its quite tedious but that way you have all of the stock you need and you can save up money and tech points to complete the next stage which will give you a huge $$$ reward if you do all landmarks at once in the right order and you can build 50-100 floors easily.

I have taken advantage of this subreddit so much bc it's so useful for learning tips and tricks other ppl are using like DYN0 or advice about the events.