This is not the only one on the Kaldor maps.
- L5 -- top left there are two, named Bridgeway and Kazona Lodge, both on the Silver Way
- K5 -- top left in Kirsta Marsh near the unfortified abbey of Ascur, named Bromella
- K5 -- north of Sirendel, named Parikyg
- K5 -- south of Nenda, named Khax
The one you are looking at is named Maerin
(logical given it's on the Maer River/Creek/Stream). I'll go out on a limb here and make a wild-assed guess, but I think they might all be abandoned Khuzan kygs. A kyg is a mine and lodge, and is hidden underground. Kerry wrote about one under Caer Gardiren: Irkhar Kyg
And obviously, the Kaldoran town of Kyg takes its name from these structures, although it's a solid bet than most residents of that town are unaware of that fact.
There you go, something fairly logical that provides some constraints, but still gives you plenty to play with.