That was taken from another post. Check your misc. quests to see if any of those are in the list. If they are, do them and then do all the others listed and see if that fixes the problem. Another thing, the Dark Brotherhood has nothing to do with the Falkreath land. I'm the head of the assassin's guild and I had no problems getting the land, once I did all of those.
Those quests listed are part of the "Rare Gift" quests that need to be done for the Yarl to give you the option to buy land.
By the Eight!
I will investigate when i get home! I think (pray) that i have the tusk quest for Ysolda in my queue.
By the look of these quests, it looks like they are count towards Thaneship in other holds. This might be something...I DO have a few misc quests (towards thaneship) in other Holds/ cities such as Solitude.
I have complieted the Civil war questline for the Imperials. I can't remember, but will the housecarl in Falkreath be at the Palace of the Kings in Windhelm where every ousted member of Stormcloak favoring leaders/ associates be?