Can,t figure out the thieves guild mission how do I get the key for fathis arens tower?

I actually wrote that walkthrough...so let me check. Here's a direct link to the quest. mahalo.com/The_Elder_Scrolls_IV_Oblivion... It sounds like you are stuck around step 25.

The only locked door I remember is an obstacle. You need to swim through the water to get further into his Grotto. I hope that this helps.

I may also be misreading your point. You can't just walk into his tower. You need to use the secret entrance in his room and fight through the grotto.

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