Very interesting. Basically, your ideas would transfer the inter-District adjacencies to intra-District adjacencies: the combinations of Buildings within the District would provide bonuses instead of the configuration of the Districts themselves. However, unless we want to add 'Tier 4' or more Buildings per District, with 5 'slots' every District could wind up being a 'mixed' District. This is not in itself a bad idea: after all, early Workshops and Markets combined work and residence areas, so Housing could be a 'generic' Building that could be added to any district. Other 'generic' Buildings that could be added to any District (except maybe Encampments) might be: Sewer - adds value to any District with Housing Mass Transit - adds value to any District with Housing, Commerce, Culture or Entertainment (Amenity) Park/Greenbelt - adds Amenity value. Avenue - a 'processional way' in ancient terms, a great wide street that adds value to any District - think the great avenues like the Boulevards in Paris, 5th Avenue in New York, Michigan Avenue in Chicago, etc. If the graphics were planned right, adjacent Districts each with an 'Avenue' could form a long connected Processional Way, with additional sections providing even more value to the city as a whole. Putting Wonders in the Districts is another idea I'd endorse: so many of the current and potential Wonders are structures within the city, not off in a separate area: the current discussion of Notre Dame brought that home to me: nobody built a cathedral out in the countryside - they are all right smack in the middle or close to the middle of the city. Notre Dame is the major structure on the Island of the City, the original Lutetia or Roman 'Paris' - you don't get more centered (City Center District) than that! That would mean, though, that each Wonder would have a Placement Requirement indicating whether it can be built and still function as a 'stand alone' out in the country - like Stonehenge, Mont St. Michel, Golden Gate, Panama Canal, or should be located where people can actually get to it: Hanging Gardens, Great Library, Hagia Sophia, etc. The influences and bonuses from Wonders might have to be extensively reworked, but that seems to need doing anyway - at least, there are several Mods already that do just that.