może tak ?

ja bym zrezygnował z kompleksu

to confuse the issue even more. Thing is, palac is not strictly speaking palace; only royalty (duke+) and bishops 'may' have a palace.

Country house? Stately home? A grand manor house? ("This is a rare opportunity to buy a very beautiful centuries-old manor house and farm complex. Fenced and ideally located, under an hour from Oporto, ...")

How about 'The estate comprises a country house with a park and a farm' or a version thereof

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Note added at 2 hrs (2006-06-29 20:46:15 GMT)
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although I agree with Adam re complex

Is it a manor, a mansion, a stately home or a castle? That probably depends on the size, number of rooms and other estoterica. According to Webster there is very little difference between a manor and a mansion. The boarding school I went to was in an old mansion and the impression I retain is that it was bigger than various manor houses I've visited. Here, it could even be something like the 'Great House'. However, I agree 100% with sparow about'pałac/palace.
But I would say that it's a 'country estate' rather than a 'complex' - that makes it sound like a health spa/holiday resort/golf course etc.
Interesting question!! :-)