Modern times is an expansion pack to Tropico 4, that adds a new campaign and a whole set of new buildings and a new edict tab. The new buildings are not had all at once- this time the date actually means something, and over the course of a mission, new buildings will be unlocked for you as you hit certain dates. They nearly all replace old buildings, and you get things like a giant pyramid house, a skyscraper office building, a car factory, and more. The missions are well done but the difficulty is kind of lacking- the new structures are really "overpowered", like a farm that grows all kinds of crops and a borehole mine that will mine a thousand minerals each month. You end up with gobs of money really fast, and so you mostly just go through the motions. Worth picking up if you liked Tropico 4's campaign.