Proudspire Manor is the most expensive house available for purchase in Skyrim. It is located next door to the Bards’ College and is near to the Blue Palace. It has many amenities available for purchase including an Alchemy Laboratory, an Arcane Enchanter, and cooking areas. Fully upgraded, the house has 15 storage containers, 5 book cases, 5 weapon racks, 2 mannequins and placards scattered throughout the many rooms. Before it is upgraded, it has more storage containers. Jordis the Sword-Maiden is the housecarl of Proudspire and can join you after you become a thane.
To purchase the home, you must first complete two quests, The Man Who Cried Wolf and Elisif’s Tribute. Upon completion, you will be able to purchase the house from Falk Firebeard for 25,000 gold. Ownership of this home is required to become a thane of Haafingar.