There’s always something to howl about.

How are you gonna keep ’em up in your vertical real estate search portal when the future of home search is horizontal — and Google’s?

Do this: Go to Google and search for Phoenix, AZ real estate. We don’t compete for that term — we’re coming in like 34th place — but a lot of people do — like 3.5 million hits for the keyword without quotes.

Here’s what’s interesting:

Out of those 3.5 million search results, Google Base’s Housing Search comes first. That would be true for any other City, ST real estate search you might want to run. You don’t need the state if the search is unambiguous.

Yes, Google Base doesn’t have a lot of listings so far — only about 4.7 million. That’s twice as many as Zillow.com has right now, but it’s still not very many. The data sources are many and disparate, so it’s plausible that there are some duplicates in there, too.

And, yes, the search interface is horrible. It hasn’t changed much, if at all, in the past year. But who is willing to bet it won’t change in the next year?

For plain vanilla horizontal search — of practically anything — Google is god — omniscient, omnipresent, omnibenevolent. If you need more than plain vanilla horizontal search, you have to go vertical — but google wants your vertical real estate search to go vertical with them, too.

There’s more. The upshot of the DOJ/NAR settlement is that the IDX level of real estate search is likely to become ubiquitous. Right now, Google Base is limping along like Trulia.com and Zillow.com — partnering relationships with a few MLS systems, a few big brokerage chains, a few listings remarkers like flyer and virtual tour vendors, and direct entry by home-sellers and their real estate agents. That’s about to change as MLS systems, either directly or through IDX vendors or VOWs, make every MLS listing available to all takers.

If you’re Realtor.com, how are you going to hang onto an audience that can get essentially the same results from the same place they get all their other results — from Google.com?

If you’re Trulia.com — Realtor.com in pastels — what do you have to offer end-users that will be so much more valuable — a year from now — that people will click through from Google.com to reap that added value.

This is what I was talking about last week:

For example, it seems plausible to me that, over time, consumers are more likely to prefer real estate listings that are richer in information, as against those that are poorer in details. If this is true, by giving sellers and agents valuable incentives for improving its content, Zillow would seem to stand a much better chance of winning the battle for eyeballs in the long run.

This is not about Zillow versus Trulia, it’s about Google versus everybody. If the coin of the realm is simply the real estate listing, it’s all over but the shouting. Google will win. They will be able to deliver virtually all real estate listings, and they will deliver them to an audience that already goes to Google for everything. For pure horizontal real estate search, no one will beat the far-and-away market leader in horizontal search.

So the challenge for every sort of Realty.bot — and for every level of real estate and loan brokerage down to the individual practitioner — will be to offer so much added value that end-users will have the incentive to click through to a more-vertical page, when confronted with Google’s horizontal home search results.

VOWs like Redfin.com have the added value of being able to initiate and orchestrate the purchase of a home.

Estately.com offers significant added-value search results beyond those available in the real estate listing — itself by now a commodity product.

Zillow.com is building an end-user-extensible database of every residence in the United States — and soon Canada.

Trulia.com offers a number of social media options, as does Zillow, but I see nothing in the listings that Google will not be able to duplicate from the same basic commodity information.

Redfin and Estately have business models based on transactions — Redfin directly and Estately indirectly by referral fees. Zillow and Trulia — and the other VC-funded Realty.bots — are advertising plays. Like Realtor.com, Trulia.com depends on ad exposures and preferred-position fees. Zillow.com’s Mortgage Marketplace enables it to collect highly-detailed financial and demographic data, which may result in very high-profit advertising opportunities for the company.

But the question for all of the ad-supported vertical real estate search portals is simply this: Is your added-value proposition enough to induce home searchers to click through to your site — rather than another, or rather than simply using the information provided by Google?

John Cook’s Venture Blog picked up my post from last week on how the design philosophies of Zillow.com and Trulia.com affect content-creation by agents and home-sellers, and how, this, in the long-run, could make a huge difference how those sites are trafficked:

This disparity of quality of information and quality of contact opportunities is replicated throughout both sites. Zillow provides more opportunities for practitioners and consumers to connect, Zillow provides a much richer — and infinitely more link-rich — profile page. And Zillow does not “muzzle the ox that treadeth out the corn” by refusing to link back to the sources of the information it displays.

Both sites want practitioners to flesh out their content with on-the-ground details, but Zillow not only provides many more opportunities for doing so, it pays substantially higher link benefits for having done this work.

The link at the Post-Intelligencer brought out a slew of anonymous sleazoids who insist that Zillow has bought my integrity by sponsoring BloodhoundBlog Unchained. Calling me names is the favorite game of people who cannot reason or write well, but this really has nothing to do with Zillow. With the exception of Realtor.com — which can bleed Realtors white through their dues if it needs to — any one of the companies mentioned in this post could fail the test of the marketplace.

That’s not the question. The question is this: What test is the marketplace likely to impose? If the battle is purely over listings, Google will win it as soon at the MLS feeds get pumping and as soon as it beefs up its search and display interface.

If, on the other hand, people who are searching for real estate in order to sell or buy real estate are looking for more than commodity-level real estate listings, then the victors in the contest for those customers are likely to be sites that provide more of the added-value content or services that those customers are looking for.

We’re not fighting over access to the listings. We never were. The contest of capitalism is won by the vendor who provides the best value at the best price. And only in real estate could this be regarded as news…

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