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New Reward Buildings 

Larger Elementary and High Schools

These new larger buildings are great for large cities or smaller cities that someday hope to grow large. They cost about 7 times more than their regular sized counterpart. Therefore, you will want to place them when you've increased the density of your development enough that you're starting to see your smaller sized elementary schools go on strike and you're at the maximum budget for those schools.

Some mayor's like to wait until they have 2 or 3 of the regular sized structures in place before plopping these larger buildings, but you can always adjust the funding sliders downward if you have to cash to place them earlier.

Deluxe Fire and Police Stations

These upgrades to your existing civic protections services offer extra services that the larger stations don't. The Deluxe Police Station comes with a police helicopter in addition to having a couple more dispatches than the Large Police Station. Put this in place when you want a 2nd or 3rd Large Police Station. The Deluxe Fire Station comes with a new dispatchable plane that is great for forest fires if you happen to have that kind of problem in your cities. Both of these stations also unlock new U-Drive-It missions, so you might want them sooner.

Large Water Pump

This helps cut down the large amount of space that multiple pumps can take. Consider this when your water demand is enough for 8 or 9 pumps. If you know your city is going to grow large, consider placing it earlier and start up a water neighbor deal to offset the maintenance cost. This is a great way to save space and make a few simoleans in the process.

From : http://simcity.ea.com