Recent sightings of Vendus Encourigitis — a local Palo Alto insect that emits pheromones that make sellers drop everything they’re doing and get their home on the market immediately — indicate that 2008 may turn out to be a similar year to several of its predecessors.

Here’s how this insect affects the local inventory cycle…

Buyers, sellers, and real estate agents go into Trypophan-induced hibernation around Thanksgiving, and tend not to wake up till early January. Not many new homes come on the market during that time, and not many buyers are out looking for them. This tends to be a time of uncertainty in the market: sellers are not confident about putting their homes on the market because, well, other sellers aren’t putting their homes on the market; similarly, many buyers are spooked out of the market because they aren’t seeing crowds of competition at open houses — ergo, this must not be a good time to buy.

Putting aside all questions of whether such assumptions and actions are rational or not, come January, swarms of Vendus Encourigitis descend on the city and — kablooei!!! — before you know it, the market gets unstuck, sellers finally put the for-sale sign up, and inventory starts its predictable upward march. Shortly thereafter, a related insect — Achetus Encourigitis — begins its work on the buyers, and sure enough, they descend en masse on open houses and begin buying.

Data provided by our friends at Altos Research shows us the pattern for the last couple of years: inventory is at a low at the end of the year, and begins to increase as soon as January rolls around:

A number of nearby towns exhibit similar patterns…

Saratoga:

Los Gatos:

What’s interesting about Los Gatos is that its beginning of the year inventory is somewhat higher than it normally is. Arn Cenedella* of Coldwell Banker notes a similar pattern in Menlo Park real estate, while Dave Blockhus*, also of Coldwell Banker, notes that Los Altos’ real estate inventory pattern is more similar to Palo Alto’s.

Further up the Peninsula, Burlingame has a similar pattern:

Roughly the same trend happens in many of the marquee towns up and down the Peninsula, while in the less tony towns a completely different picture is emerging — more on that in a later post.

* Dave and Arn are both clients of 3 Oceans’ sister company Domus Consulting.

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After a wonderfully fun — and occasionally frustrating — evening of hacking around, I’m please to present this mashup of Bay Area housing price trends. The graphs are from our friends at Altos Research, and the Google Maps were created using Zeemaps from Zeesource.

For a larger map, click here.

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Now ya don’t have to be a programming genius to put together neat mashups. I put this together using Altos Research data and a Zeesource map.

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If there’s one thing I learned from my tenure in consulting (apart from the names of the cabin crew on the mid-Sunday afternoon American Airlines flight from SFO to JFK…) it’s that the numbers always tell a story.

Remember this neat little chart from our little “Frolick with the data” yesterday, provided by those whiz-bang numbers folks at Altos Research?

Statistically-challenged reporters (is there another kind?) look at this and concoct two dramatic headlines, depending on whether you look before or after July 2006: “Prices drop dramatically!” or “Prices increase dramatically!”

Both headlines are, technically, true — in the same sense that your favorite team’s one-game loss could be a “losing streak” and a one-game win could be a “winning streak.”

What’s behind these numbers?

Quite simple: The variation in prices this year in Palo Alto is due nearly entirely to the difference in home size. Put another way, home prices fell between January and July because smaller homes were selling, and home prices rose between July and October because larger homes were selling. Boring facts like that don’t sell newspapers, however, which is why you’d never get an explanation like that in the San Jose Mercury News.

Check this out:

From January to July, median prices dropped 17%, most steeply between January and May, and less steeply from May through July. From July till now, prices have increased 13%.

Now let’s look at what happened to median home sizes during that time:

Uncanny, isn’t it? From January to July, we get a 20% drop in median square footage, and again we have a more steep decline from January to May, and a less steep one from May to July. From July till now, we have a 13% rise.

The fall and rise of median property prices matched nearly identically the fall and rise of median home sizes. The mild difference between the two sets of numbers — a 20% drop in sizes, but only a 17% drop in prices — is fully explained by the differences in price per square foot:

So what’s the real story? It’s not “Prices are falling!” or “Prices are rising!” but something far more boring and completely unlikely to sell newspapers: The price per square foot of homes in Palo Alto has stayed pretty much the same this year, varying by less than 3%. For the first 7 months, there was a steady 20% decline in the size of homes being sold, followed by a steady 13% increase in size.

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