

The Opera House needs a city to extract 3,000 units of any natural resources.The airport doesn't even need a connection to the rest of the city, and players don't need to keep it. The Grand Mall unlocks when players build an airport.Players should eventually reach this number without trouble by building parks and other entertainment buildings (including unique buildings), which they should be doing anyway to bring up the land value so zoned buildings can level up. The Expo Center requires a total tourist count of 2,000.It costs 1,500,000 to build and 16,000 to maintain. The Space Elevator requires the Expo Center, the Grand Mall, the Opera House, the Stadium, the Statue of Wealth, and the Transport Tower. Park buildings do all the same things while taking up less space and costing much less, and so the only reasons to build these objects are to decorate the map and to qualify for a monument.

Unique buildings are also very expensive, both to build and to maintain. They can also boost land value, but unlike parks they often generate noise pollution. Regardless of their shape or description, all unique buildings are entertainment venues that attract both local visitors and tourists. The last thing players should know is what unique buildings do. These unique buildings still have requirements, but players won't get access to a monument as a reward for meeting them. Two of them come with the base game, 12 of them are available when players activate the free European style mod, and several more come with various expansions. There are also unique buildings that don't unlock monuments. So while some requirements can sound hard to get or like they'd destroy the city, Cities: Skylines doesn't care if players "cheat" to get them. If they then switch off their mods and load a regular game, they can still get the monument achievements. Players can also unlock unique buildings by playing a game with infinite money on or by downloading a save game that meets the building's requirements. Even if players unlock a unique building and then load an earlier save, deleting everything they did, the building stays unlocked. In every future game, players can build an unlocked unique building as soon as they have the population and the money to spare. Second, once a unique building unlocks, it stays unlocked forever for that copy of the game.

If a city hasn't reached the right milestone, then players can't construct unique buildings from that tier even if they've unlocked them. First, each unique building belongs to a specific tier, and these tiers unlock at different population milestones. Before discussing the monuments, players should know a few things about unique buildings.
