With the Dark Brotherhood quest "Kill Helvard" completed, Lakeside Manor apparently isn't available for purchase anymore. In my case Siddgeir and Nenya are Jarl and Steward.

It has been suggested that setting [setrelationshiprank] to high value, could make it available. Not so in my experience.

Has anyone an idea how to solve this through some kind of action or through the console?

I never killed Helvard but I never bought the land from him either. Nenya should be the one selling it. Did you do the jarl's two quests? You have to complete both of them before he'll even mention letting you purchase land in Falkreath.

It's my level 78 character that has done just about everything there is to be done in the game, including becoming Thane of every Hold. I've just seen on UESP it's marked as a bug so I guess I'm not the only one who's having this issue.

Maybe there's something to be done with console commands but I'm no expert on that.

OK, solved. This works. player.setrelationshiprank 000xxxxx 3 Where the x-s represent the character code of the Jarl. You can get this by standing in front of the Jarl, entering the commandline and clicking the Jarl. After that, Nenya has the speech option to sell you land.

Yesterday, Helvard's corpse was still lying in the Jarl's building (where I dropped him for the DB quest) with Nenya kneeling over him going "omigawd what happened here!?". I'd been made Thane a while back because I'd done the required jobs for the Jarl and the Steward. With Nenya seeming to have discovered the corpse for the first time, I was able to do the land deal. So I believe it's just a matter of doing enough work for the community and a few radiant quests to be made Thane. Stealthily offing Helvard in the middle of this series of tasks didn't seem to mess up anything.

It's a bug in and of itself that his corpse is even still there after all that time. Suggests the quest holding his alias isn't shut down properly. He was there when I walked into the Jarl's longhouse, dead in his bed where I slit his throat back in December. I can't imagine the smell after all that time! Nobody thought to check on the poor guy?

At the very least, his NPC probably needs the unique body cleanup, but that doesn't work if he gets that assigned after he's already dead.

A bug has been filed for this on the UHFP tracker, but if it's only a matter of getting back on the Jarl's good side with radiant questing or something then that's not a problem. Just rather inconvenient that somehow they know it was me who killed the housecarl.