This expansion is compatible with both 1st and 2nd editions of 7 Wonders, though if you alreayd have 7 Wonders Babel you may find this similiar to the great projects.  The wonder boards are 2nd edition size..but  this doesn’t impact the rules nor the gameplay)

7 Wonders Edifice is the newest expansion for 7 Wonders, but it’s also the simplest to set up and explain. In 7 Wonders Edifice, players will set their differences aside and work together to build majestic Edificies. These projects are far too large and imposing to be completed by a single city.

Players will have the choice: participate in the project to gain benefits or go it alone and suffer the consequences.

7 Wonders Edifice introduces new interactions between players, without prolonging the length of the game.   

What the expansion adds 
During setup, 3 Edifice cards (1 per Age) are placed in the center of the table. These are the three Edifices that may be completed during the game.  Help construct an Edifice to receive a token that makes you eligible for rewards if it is eventually completed. Be careful though, there is always one token fewer than players! Not everyone can help with the construction.   At the end of the Age, if enough players have participated, the Edifice is constructed. Players with tokens gain rewards. Those who chose to go it alone will suffer a penalty. 

2 new Wonders
Introducing two new wonders in 7 Wonders Edifice, Ur and Carthago, adding even more variety and strategy to the award-winning board game.   The effects of the Ur Wonder are specific to the 7 Wonders Edifice expansion. Carthago can also be played with the base game, independently of the expansion