The Embassy is a busy place: Diplomats from all over the world negotiate contracts here, forge treaties and found alliances. In order to get a larger alliance you need to upgrade your Embassy. Also, every level of your Embassy increases your diplomacy points.
A player cannot remove the last Embassy built. After joining an alliance, one must maintain at least one Embassy. To move or remove an Embassy from one city, another must be built elsewhere first.
For more info on the usage of embassies: see Treaties
Research and Reduction Building bonuses are shown in the following charts by mousing-over over the research abbreviations (P – G – SL – MR) in the chart.
You can mouse-over the letters in the "Minimum " column to see how many Warehouses are needed for that level.
You can also mouse-over the numbers in the "Build " column to get the longer version of what the numbers/Letters represent.
These reductions are separate and in addition to the researches, for up to an additional 50% reduction. providing a minimum of 64% reduction in resources.
An Architect's Office reduces requirements by 1% for every level built. (up to 50%)
A Carpenter reduces requirements by 1% for every level built. (up to 50%)
A Firework Test Area reduces requirements by 1% for every level built. (up to 50%)
An Optician reduces requirements by 1% for every level built. (up to 50%)
A Wine Press reduces requirements by 1% for every level built. (up to 50%)
These increases are separate and in addition to the production buildings, for 7 day increments, making the maximum possible increase in production 172%.
and 
