Where Is the Thieves Guild Hall in Oblivion?

Dareloth's House is the home of the Thieves Guild's founder, in the Imperial City's Waterfront District behind the Abandoned Shack. The building is divided into Dareloth's House, the Guildmaster's Quarters, and Dareloth's Basement. It is only accessible after The Ultimate Heist is completed.

How many thieves guild quests are there in oblivion?

There are 14 Thieves Guild quests. It is possible to join the Thieves Guild without ever starting Finding the Thieves Guild. This method must be avoided if seeking 100% completion of quests.

Where can I find Ongar?

Ongar lives a simple life of sleeping and drinking, he can be found most often at Olav's Tap and Tack. When he isn't at the bar, he is at home sleeping. His home is plain, there is little of value inside except a few books.