Part of my response would depend on "for karma vs. for IGC?"
I would say that I am interested in properties that are available for IGC. Only 7 of the 49ish properties on the Real Estate list are available for cash (there are even more karma-only properties NOT appearing on that list; e.g., the Walnut Grove Farms). I think that says something about demand right there. We currently already have Farms, Two Story Houses, Crypt Dwellings, and Sewer Dwellings available... all for karma. They don't seem to be selling.
So I marked "other". I think that if we're going to create more for-karma purchases, they have to be NEW things rather than the same old.
I'd, of course, be interested in virtually anything that doesn't cost karma.
If I had to come up with my "other" however, I'd offer:
- MORE TRAILERS. They didn't make your list.
- A smaller version of a farm: a plot of land I can grow stuff with no house or with a one-room shed; available for cash or less karma... I might be persuaded to drop 30-40 karma on something like this. (Maybe? I haven't bought a 75 karma farm, because the going rate for IGC --> karma is so freakin' high that I'd prefer to buy a field of Hydroponics and put them in a cabin. Chicken-spawning isn't worth 75 karma to me.)
- A storage unit: a 2x2 hole in the wall in a huge "parking lot" full of similar units that would allow me to hide myself, lockboxes, and fade portals. If the "parking lot" had roads networked through it to make getting to a far-off unit less energy-intensive... all the better. Probably for cash?
- A mansion. A HUGE house in a gated community (tighten security there somehow?). In the range of a million dollars IGC. Burn through some of that massive money floating about in our pockets.
Also, the Shadow Realm lair appeals, but I'd have to know some things about it first. Is it stationary, or does it move? If it moves, will I know where it is? Can I "decorate" it? Since we can't use powers in the SR, does that mean people can't Uninvited Guest themselves in? If I have Enter Shadows, can I transport myself directly there? Can I stay there more than 24 hours, or re-enter more than once every 48, or do my normal Enter Shadow limitations apply? Et cetera. I might find a way to raise the karma for this, depending on the answers to those questions.
Things I'd also like to see, but can't think of good ways to implement:
- Bunkers (a field of bunkers makes no sense to me, but maybe individual rooms in a large bunker would... maybe that's a Lair thing though).
- Something out in the wilderness that isn't just another cabin. I don't know what is required to keep Fae out: log cabins apparently work, but I don't imagine tents would. Maybe I'm envisioning bunkers again.
I'll come up with more.