Rosethorn Hall is the most expensive house the Hero can purchase in Oblivion. The house is located in the northeastern section of Skingrad, on the west corner of the eastern arterial road connecting the North and South sections of the city.
The house is bought from Shum gro-Yarug, who can be found at Castle Skingrad in the day-time, or in the Inn. If one has trouble finding him, talk to someone in Castle Skingrad about buying a house and they'll direct the Hero to him with a map marker so they can easily find him.
To be able to purchase this house, the hero needs 25,000 , a fame of 15, and have a disposition with Shum at 70 or above. Buying this house will kick out its former tenant.
Be warned that Shum might die (fall off of high walkway when exiting the castle), which will make the quest unfinishable.
The house has a basement and three stories, and the master bedroom is on the top floor. After buying all of the furnishings, the house will be decorated and have many chests and display cases to place items in. There is also an exterior balcony on the second floor.