The Manorial Palace is from the Venice-Addon, and is a custom-build palace. The Manorial Palace is the first of several buildings which you can use to tailor your estate to your own needs. Over the course of the game several different auxiliary buildings will be unlocked, which you can then place around your main building as you see fit.
There are innumerable ways to combine your main and auxiliary buildings. Let your imagination fly. Together with e.g. cypresses, fountains and hedges you can build your estate the way you want it.