Riveria: The Enterprise Company is based out of their own castle "Verwood Keep" near the small village of Verwood. They were given right to this castle and royal charter (and assistance) to build it some years ago after their heroics kept the King's throne under him...since then, they've poured thousands of their own g.p. into expansion. This Company forms the basis of both main Riveria parties (i.e. the two games I run each week), and many retired characters and hangers-on usually stay at the keep, along with a small staff and a few local guards...and a battleaxe of a seneschal, their token nod to organization. Once a year or so, we'll sit down and do some very generalized dice rolling to sort out the operation and finances of the keep, otherwise both I and the players just kind of assume it runs itself.
Having a well-known base like this is both useful - adventurers arrive in a slow but constant trickle looking to join up, providing a neverending supply of new PC's if required - and dangerous - the keep has already had to withstand one major assault in revenge for the Company's interference in some nearby piracy operations.
Before they got this castle, they had a farm...also given them as a reward...but for various reasons they were rarely if ever there.
Beory: The Company of the Green Cloak has a farm some few hundred miles northwest of Gradsul, but other than by a few retired characters we just don't use it much; it's too far from anywhere useful and our adventures tend to take place in far-flung lands.
Our older games tended to have individual PC's set up their own home bases...temple, villa, keep, palace in one case, pub/inn in many cases...without regard to the rest of the party; the idea of the adventuring company hadn't taken hold yet. Then, a party would base itself out of whichever PC's home was most convenient for a given adventure.
Lane-"my current home is a pub half a mile from Verwood Keep"-fan