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In February, Zillow appeared so confident in its ability to use artificial intelligence to estimate the value of homes that it announced a new option: for certain homes, its so-called "Zestimate" would also represent an initial cash offer from the company to purchase the property.   The move, touted by a company exec at the time as "an exciting advancement," was intended to streamline the process for homeowners considering selling to Zillow as part of its home-flipping business. Zillow promoted this option as a way to make it convenient to sell a home while minimizing interactions with others during the pandemic. Just eight months later, however, the company is shutting down that business, Zillow Offers, entirely.

The decision to shut down the program, announced last week, marks a stunning defeat for Zillow. The real estate listing company took a $304 million inventory write-down in the third quarter, which it blamed on having recently purchased homes for prices that are higher than it thinks it can sell them. The company saw its stock plunge and it now plans to cut 2,000 jobs, or 25% of its staff.


The fallout from this business venture doesn't just point to the challenges in buying and selling homes for profit, however. It also highlights how hard it is to use AI to help make expensive, real-world decisions, particularly in an ever-changing market that can be hard to predict months or even weeks out, and with prices that can be based as much on feel as on clear data points. Zillow CEO and cofounder Rich Barton explained the shuttering of Zillow Offers by citing "unpredictability in forecasting home prices" that "far exceeds" what the company had expected.

The "iBuyer" model used by Zillow and other other real estate companies entails purchasing homes directly from sellers and then re-listing them after doing minor work. For Zillow, one of the first steps in its decision to purchase any home is the "Zestimate" — a machine-learning-assisted estimate of a home's market value that is calculated by taking into account oodles of data about the property gathered from sources including tax and property records, homeowner-submitted details such as the addition of a bathroom or bedroom, and pictures of the house. Rival platforms such as Redfin have their own estimates that take similar data into account.


"The Zestimate, facts you provided, and comparable homes nearby are used to calculate an estimated sale price," Zillow explained on its Zillow Offers webpage to homeowners who may be interested in selling their property to the company. (The page now notes the company is "winding down" the service, and isn't making new offers on homes.) After that estimate, the page explained, Zillow conducts an in-person evaluation of a property, determines the amount it deems necessary for repairs before it could resell the house, and then makes a final offer. Zillow has bought tens of thousands of homes since the launch of Zillow Offers, but has sold many fewer than it snapped up: according to its quarterly results, it purchased 27,000 homes from April 2018 through September 2021, and sold nearly 17,000.


Zillow declined a request for an interview with Krishna Rao, the company's vice president of analytics. In a statement, Zillow spokesperson Viet Shelton told CNN Business the company used the Zestimate for Zillow Offers "the same way we encourage the public to use it: as a starting point.  The challenge we faced in Zillow Offers was the ability to accurately forecast the future price of inventory three to six months out, in a market where there were larger and more rapid changes in home values than ever before," Shelton said.


Indeed, since Zillow entered the home-flipping business in 2018, real estate markets have changed in wildly unpredictable ways. The pandemic led to a temporary housing market freeze, followed by a supply and demand imbalance that caused an unprecedented rise in home prices. This may only have complicated the company's decision to include the Zestimate — which Zillow points out is not an appraisal, but a "computer-generated estimate of the value of the home today, given the available data" — as part of the Zillow Offers process in more than 20 cities.


Artificial intelligence can look at far more information, far more quickly, than a single human could when considering a fair price for a home, weighing factors like comparable home sales in an area, how many people are looking in a specific neighborhood and so on. Still, "you can have a real estate agent look at a house and in one second pick out one critical factor of the valuation that just doesn't exist as ones and zeroes in any database," said Mike DelPrete, a real estate technology strategist and scholar-in-residence at the University of Colorado Boulder.

A key part of Zillow

The Zestimate has been a key part of Zillow's brand since the company first launched its website in 2006. The term is featured prominently on millions of Zillow's home listings; it's trademarked by the company; and it's mentioned 61 times in its IPO paperwork from 2011.

"Three times a week, we create more than 500,000 unique valuation models, built atop 3.2 terabytes of data, to generate current Zestimates on more than 70 million US homes," the company wrote in a securities filing in 2011. More than 10 years later, the company publishes Zestimates for more than 100 million US homes.


If you're looking up homes on Zillow's website or app, the Zestimate is featured prominently in each listing, whether the home is for sale or not. If the house is currently for sale, a red dot is shown next to the words "House for sale," and the Zestimate, if it's available for that home, will appear on the same line.


Though the company points out that the Zestimate is not a home appraisal, the feature's accuracy has been called into question over the years. For example, it became the subject of a lawsuit brought by homeowners in 2017. (That suit was dismissed.)

Zillow has spent years improving the Zestimate, going so far as to run a multi-year data science competition to improve the accuracy of the algorithm behind it. The company awarded a three-person team the $1 million prize in early 2019.

The Zestimate currently has a median error rate of 1.9% for homes that are on the market, Shelton said, meaning Zillow's estimates for half the homes on the market come within 1.9% of the actual selling price. That percentage of error is much higher -- 6.9%, according to Shelton -- for off-market homes. Being off by as little as 1.9% on a property with a Zestimate of $500,000 is still nearly $10,000; that figure multiplies over many, many homes in different cities across the United States.

An art, not just a science

It's one thing to build a model on a website that's often reasonably accurate. It's another to then try to use that model in the real world to make very costly bets — and do so at scale, according to Nima Shahbazi, a member of the team that won the Zestimate algorithm competition and CEO of Mindle.AI, which helps companies use AI to make predictions. For instance, if any homes Zillow purchased had hidden problems — such as a missed crack in the foundation — the Zestimate would not be able to predict those issues, he said.


"There are many different parts between a very decent model and deploying the model into production that can go wrong," he said.

Zillow was using the Zestimate to help it make purchasing decisions for homes it hoped to make a profit off of over time. But Nikhil Malik, an assistant professor of marketing at the University of Southern California, said algorithms tend to be good at making fine-grained, short-term predictions, such as for predicting stock prices a second in advance. But there simply isn't enough data for an algorithm to learn about longer busts and booms, according to Malik, who researches algorithmic pricing and has studied the Zestimate in particular.

There are also many unquantifiable aspects of putting a price tag on a home, DelPrete noted, such as the value of living in the same neighborhood you grew up in or down the street from your parents. These can vary from person to person, which makes it even harder to outsource a home valuation process to a computer.


"It's a good tool for what it is," DelPrete said of the Zestimate, but it's a mistake to think it can be used to accurately predict house prices now or in the future. He sees it as "almost a toy," meant more for piquing your curiosity when looking up your home or your neighbor's home online.

"If you want to do iBuying and you're going to make thousands of offers every day you have to be really good at valuing homes, not only today but three to six months in the future," he said. "And that's an art and a science."

  • CNN Business, November 9, 2021

Homeowners in Dallas and across the country are staying put longer

One reason there are fewer houses for sale is that homeowners are staying put longer.  The average Dallas-area homeowner has been in his or her house almost eight years, according to a new report by  The mortgage company looked at homeownership tenures in major markets around the country.   "Our study found that there's an inverse relationship between home price and the length of time people stay in their homes," the LendingTree report found. "In other words, prices rise more quickly when people stay in their homes for shorter time periods."   The amount of time homeowners stay in a property has grown significantly since the Great Recession.  Before the economic downtown, homes tended to turn over every three to five years. But owners are remaining in their properties longer and have been more likely to remodel or refinance rather move.  That has contributed to the shortage of houses on the market in many U.S. cities.

              • Dallas Morning News, March 6, 2020



Lawsuit: Bad Zillow Info 'Corrupted' Price on $150M Mansion

Once the most expensive listing in the US, the Bel Air mega-mansion was incorrectly listed as sold multiple times. The seller of one of the nation's most expensive real estate listings is suing real estate giant Zillow Group for $60 million in damages, alleging the company was negligent when it allowed a "troll" to falsely claim they were the homeowner of the listing on Zillow and then posted inaccurate information about the property.

The listing, 924 Bel Air Road in Los Angeles, was first listed for $250 million in 2017 and cut to $188 million last year before coming back on the market at a $150 million price in January.

In a lawsuit filed on Feb. 24, the plaintiff, a company owned by Makowsky, alleged Zillow published false information about the property that was uploaded by someone claiming to be the listing's owner. This included claims that the home had sold on Feb. 9, 2019 for $110 million, that there was an open house for the property on Feb. 8, 2019 from 1-4 p.m., that the property sold on Feb. 9, 2019 for $90.54 million, and that the property sold on Feb. 9, 2019 for $93.4 million.

"Zillow is disseminating misleading, false, and inaccurate information that has a large prominence because of Zillow's market power," attorneys for the plaintiff wrote in the complaint.The plaintiff's attorneys alleged that it took Zillow more than a week to take down the false information and false claims of ownership, despite Zillow acknowledging it was "aware of the issue."

  • Inman News, March 1, 2019



Diverse Nation

Migration into the state, coupled with generally higher fertility among Latinos than in the non-Hispanic white population, has driven an increase in the state's Latino population, according to the Chris Potter with the U.S. Census Bureau.Texas added 234,000 Hispanic residents this past year, the most of any state, bringing the overall Hispanic population to roughly 11.2 million. "We had projected that the Latino population would exceed the ... white population by 2020 and that's probably not going to happen," Potter said. Based on the new trends, he said, he now expects Latinos to outnumber non-Hispanic white people in Texas by 2022. That's probably a result of a slight decline in birth rates among Latinos as well as a slowing of immigration from Mexico and other Latin American countries over the last decade, according to the U.S. Census Bureau. Meanwhile, growth in the state's white population has effectively flattened. In any case, demographers have said for years that Texas' increasing ethnic diversity will shape the state's future. The Lone Star State's populations of Asians and people who identified as two or more races both grew by about 4 percent over the year. And at 3.8 million, Texas had the largest black or African-American population of any state in the country.

Experts caution against expecting demographic shifts — which tend to move slowly — to immediately translate into political shifts.  In Texas, at least, Southern Methodist University political scientist Cal Jillson told The Dallas Morning News when former Dallas County Sheriff Lupe Valdez became the first Latina to win a major-party nomination for governor, "there's a 20-year gulf between where we are now and when a Hispanic electorate will help create a [Democratic] majority."

  • Dallas Morning News, June 21, 2018

Thanks to a little-noticed auction sale, a San Francisco couple are the proud owners of one of the most exclusive streets in San Francisco — and they're looking for ways to make their purchase pay.  Tina Lam and Michael Cheng snatched up Presidio Terrace — the block-long, private oval street lined by 35 megamillion-dollar mansions — for $90,000 and change in a city-run auction stemming from an unpaid tax bill. They outlasted several other bidders.  Now they're looking to cash in — maybe by charging the residents of those mansions to park on their own private street.

Those residents value their privacy — and their exclusivity. Past homeowners have included Sen. Dianne Feinstein and her financier husband, Richard Blum; House Democratic leader Nancy Pelosi; and the late Mayor Joseph Alioto. A guard is stationed round the clock at the stone-gate entrance to the street to keep the curious away.

So imagine the residents' surprise when San Jose residents Cheng and Lam wound up with the street, its sidewalks and every other bit of "common ground" in the private development that has been managed by the homeowners since at least 1905. That includes a string of well-coiffed garden islands, palm trees and other greenery that enhance the gated and guarded community at the end of Washington Street, just off Arguello Boulevard and down the hill from the Presidio.  The homeowners, however, are crying foul and want the Board of Supervisors to negate the sale.

The couple's purchase appears to be the culmination of a comedy of errors involving a $14-a-year property tax bill that the homeowners association failed to pay for three decades. It's something that the owners of all 181 private streets in San Francisco are obliged to do.  In a letter to the city last month, Scott Emblidge, the attorney for the Presidio Homeowners Association, said the group had failed to pay up because its tax bill was being mailed to the Kearny Street address used by an accountant who hadn't worked for the homeowners since the 1980s.

  • San Francisco Chronicle, August 7, 2017

For years, top civic and elected officials across Collin County have boasted about their top-quality schools, family-friendly communities and vast expanses of open land ripe for development.   Their efforts have attracted people in droves. Since 2000, Collin County's population has grown nearly 90 percent. If that pace continues, the county could double its current population before 2035 and exceed the populations of Dallas and Tarrant counties by 2050. 

Developing all the available land is still decades away. But growing pains are an annoying reality now for many Collin residents, whether they're feeling overrun by high-density developments, struggling with higher property taxes or getting stuck in traffic.   Some are speaking out against the boom. Others are resistant to policy decisions that attract even more people. As the explosive growth continues,  community leaders are trying to balance the needs of newcomers with maintaining the quality of life for existing residents.  They're finding out that not everyone sees increases in people and development as a good thing.

Collin County growth

The population grew by 59 percent between 2000 and 2010 and by nearly 90 percent between 2000 and 2017.

2000 Census

2010 Census

2016 Estimate

2017 Estimate





SOURCE: North Central Texas Council of Governments

-        Dallas Morning News, June 30, 2017


Some Experts Predict That Businesses Leaving California Could Increase 4-Fold
Texas Prepares For More California Business Relocations to the State
(Over one third of signatures collected, 5 months to go in gaining signatures)
A campaign for California to secede from the rest of the country over Donald Trump's election is gaining momentum, with supporters allowed to start collecting signatures for the measure to be put to a vote.   California's Secretary of State Alex Padilla gave the green light on January 26th for proponents of "California Nationhood" -- also known as Calexit -- to start collecting the nearly 600,000 signatures needed for the measure to qualify on the November 2018 ballot.   The 585,407 signatures required by July 25 represent eight percent of registered voters in California -- the most populous state in the country with nearly 40 million residents and the world's sixth-largest economy.  Should the initiative make it on the ballot, a "Yes" vote would repeal clauses in the California Constitution "stating California is an inseparable part of the United States and that the United States Constitution is the supreme law of the land," a statement by Padilla's office said.   Voters would then need to decide in another referendum in 2019 whether California should become a separate country.   Padilla said the independence measure -- deemed highly unrealistic -- would have a deep impact on the state and would likely face legal challenges.   "Assuming that California actually became an independent nation, the state and its local governments would experience major, but unknown, budgetary impacts," he warned.   Businesses are alarmed and watching the sittuation closely.
     -       Yahoo News, January 27, 2017

Most of the United States' 11.1 million unauthorized immigrants live in just 20 major metropolitan areas, with the largest populations in New York, Los Angeles, Houston and Dallas, according to new Pew Research Center estimates based on government dataThe analysis shows that the nation's unauthorized immigrant population is highly concentrated, more so than the U.S. population overall. In 2014, the 20 metro areas with most unauthorized immigrants were home to 6.8 million of them, or 61% of the estimated nationwide total. By contrast, only 36% of the total U.S. population lived in those metro areas.  By far the biggest unauthorized immigrant populations were in the New York and Los Angeles metro areas (1.2 million and 1 million, respectively). No other metro area approached a million. Among the top 20 areas, the smallest unauthorized immigrant populations included Orlando (110,000) and Austin (100,000).  Of course, these numbers will become increasingly important over the coming months as the Trump administration continues to develop policy related to what will undoubtedly be a controversial topic for the next 4-8 years. 

- PrisonPlanet, February 10, 2017


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