I want to double major in business admin/business econ with linguistics, and perhaps get an office job or do international business (linguistics = languages = language is important in business?).

I’m planning to transfer to a 4-year-uni (hopefully UC Berkeley, UCLA, or UC Irvine).

Is this a good idea, or should I just stick with business admin? I want to stand out, since there are a lot of business majors! What are my other alternatives if linguisitics is a bad idea?

That is an excellent idea. You just need to understand that learning a language is time consuming and you will need to find ways to practice it every single day!
I myself speak three different languages and have my MBA. I still havent adventure to work in my domain, as i am working as a Systems Admin.
Having another language is defenitely something impressive and nowadays it is a must if you care to diferentiate yourself from others somewhat. But, one thing that will REALLY help out in the future is to really work in your delivery for anything you work on. In Business you want people to be confident in you and you want them to believe in whatever it is that you are offering them. Work on that, and you will ceraintly work for a better path than most!
*IF I were you, I would really concentrate on the Business end of the Education. Language, you can learn that on the side or take 6 months abroad and learn whatever language of interest you have as an exchange student. This way, if you dont have that type of brain, not everyone has it to learn another language, it will not kill your GPA or waste your time. But, going away is something I def. recomment.

Usually when I search for a type of Business google has many names and addresses of the businesses immediately and it’s included on google maps. But if my business consists of services primarily provided in a customer’s Home (and I don’t have an office yet) can it still be listed? Without an address?

There’s a new feature in Google Places for businesses that allows you to list a "service area." When you do this you can also exclude your address.

Not showing your address seems to lead to lower rankings, so I would definitely add it if you get an office sometime down the line, but this will at least get you listed for now.