That is tiny! It's not a scale I've ever played with, but it looks like fun...
Actually if you lot like this you will definitely like the following:

Sydney Town Hall:
http://www.sydneyarchitecture.com/cbd/cbd3-001.htm"Town Hall was built in the 1880s from local Sydney sandstone in the grand Victorian architectural style, and remains the only non-religious city building from the era to retain its original function and interior"... I wonder if the youth of 1880s used the steps as a meeting place like they do now!

Art Gallery of NSW: more like neo-classical style former user mentioned. There are two statues out the front. One is called Offerings of War, the other Offering of Peace (someone clever so and so put a beer can on it once).
This is a pretty good website:
http://www.sydneynaturally.com.au/sydney.htmAnd here's our old Post Office:
http://lh6.ggpht.com/_MNNty0rLlyI/Rt0TFhOSalI/AAAAAAAAAMA/lyI-u2zwda4/s640/100_0030.JPGHopefully some inspiration

It's an interesting city. A wrong turn can either find you dead, or looking at a building that has been there for ~200 years.
The Rocks is a bit like the latter. There is an old puppet shop you can go into, and you walk downstairs, potter around amongst the muppets, and then walk out the back into an alley that used to be a fireplace from Colonial times. It's good for the imagination