You may be able to permit it with minimal work and money but have a visual FIRST!!!
Not all un-permitted work needs to be torn out......
Any other questions CAcertified@yahoo.com
Tony Perez , owner
You might be able to locate the homes floor plan documents somewhere inside the home. Many builders will place these documents in a closet or inside a cabinet somewhere inside the home. Many homeowners do not even realize the documents were there and leave them behind when they move on.
With regards to your permit questions. You will need to visit the City Planning Department. Let them know you're looking to buy a home in the City and ask to view the file they have for the home. Any permits and other documentation regarding that home will be in the file. If you do not see the Permit on file, then you will need to explain to the City Planner the addition you have discovered on the home and inquire as to what it will take and cost from the City stand point to bring that room up to code if you infact purchase the home. You also must make sure to hire a property inspector. Ask the inspector to take a close look at the addition and ask them to evaluate any potential damage to the homes structure if you're infact are required to remove the addition by the City.
You can also contact Daryl Overlock w/American Home Source at (626) 914-2707 for any Contractor needs. Let Daryl know that I referred you and that you would like an estimate to either tear down the addition or to bring it up to code. Be sure that you gather this information during your due dilligence period prior to waiving your contingencies. Your Agent sould be able to help you coordinate these steps. Good luck!
Century 21 Judge Fite Company