Ok so I have both Hearthfire and Dragonborn dlcs installed. While on one of Jarl Sidgier quests I came back and found vampires attacking the jarls loghouse so I fought Helvard got killed and I didn't realize till much later that him dying was going to screw me up. Now the Jarl's favor towards me is very low. I even tried the whole radiant quest even though with the dlcs it is not required, and nothing. No command comes up. I really don't want to go back to a very old save. Right now I am trying to do the quests that lead to Seasons Unending quest where I can just give Falkreath to the stormcloaks so that there will be a new Jarl but I have also heard that just uninstalling the dlc for the vampires could also reset it. If anyone else knows of any other ways that would be appreciated. One more thing my game is on the ps3 just in case that would make a difference.

Uninstalling the DLC won't help because then your save would become unplayable. Your best course of action is to replace Sidgeir as Jarl like you already mentioned. Then see if you can buy the property from the new Jarl (who should give it to you without having to do any quests because he is glad you gave him the throne). This might not work either though, because I'm not sure if a change in Jarl = a change in steward. You just gotta try it out.