Hi Michael,
I must politely beg to differ with the advice being given by David and Hampig regarding a virtual office. Google is not in favor of these and, in fact, should such an office come under scrutiny, it could cause serious damage to your whole local profile. Because of this, I do not advise purchasing a virtual office, using a P.O. Box or anything along those lines.
You are quite correct that lack of a physical office in Austin will make it next to impossible for you to rank in the local set of results for Austin-based searches or searches containing the word 'Austin'. Google considers a business as being most relevant to its city of location - not to neighboring cities - so in Google's eyes, you are a Bee Cave business, not an Austin business.
I empathize with the frustration of this. Tons of business models (carpet cleaners, chimney sweeps, realtors) serve within a wide radius, and tons of businesses are located just on the borders of big cities like Austin or Dallas, but Google's local product just isn't set up to favor these business models.
This means that your attempts to rank for Austin are going to have to be organic rather than Local. Now, that being said, Michael, I am seeing a couple of areas of concern that I thought I'd point out as I noticed them while taking a look at your business. Here is the Google+ Local Page I found for your business: https://plus.google.com/111099812929349352484/about?hl=en
On it, I see the address being listed as: 13500 Galleria Circle #115 Austin, TX 78738
As you've stated, you're not in Austin, so where did this address come from?
Also, in the business description field, I see this:
The Experts in Austin Real Estate
This needs to be rewritten to avoid possible penalties. Never put geographic terms in your business description.
Further, I see that a bunch of your reviews mention the names of agents at your business. You have little/no control over what others write, but there is some thought that the use of names may be a cause of lost reviews. If they disappear (as thousands/millions of reviews have done lately) you may want to remember this, because it could possibly be the cause. Google is just a nightmare for reviews right now.
One other thing that can be very difficult for multi-partner or multi-agent firms such as realty firms, law firms or medical practices is the allowed use of creating unique Places-based listing for each partner in the firm. Google allows this, but rankings can tank if multiple partners are using the same categories, or, listings can be merged because of similarity in business name, address or phone number. I don't know if this is an issue with your business at this point, but if you were actually located within Austin and having trouble ranking, this would definitely be a point I'd investigate.
So, bottom line, short of getting a legitimate office in Austin, ranking in the local results for things related to that city cannot be seen a very realistic goal for your business. It's not that it never happens, but it's very, very rare. Perhaps the business will be able to relocate there at some point in the future, but until that time, your true local efforts should target and appropriately reflect Bee Cave, while your organic efforts can target Austin. Hope this helps, and good luck. You are in very enormous amounts of company in wishing Google handled things like this differently!