Is The Risk Of Sea Level Rise Affecting Florida Home Prices? A New Study Says Yes : NPR

A new study has found that home sale prices and volume appear to be declining in Florida coastal areas at vul...


A new study has found that home sale prices and volume appear to be declining in Florida coastal areas at vulnerable to rising sea levels compared to coastal areas with less risk. Here, the balcony view from a luxury condo in Sunny Isles Beach, Fla., in 2017.

Rhona Wise/AFP via Getty Images


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Rhona Wise/AFP via Getty Images

A new study has found that home sale prices and volume appear to be declining in Florida coastal areas at vulnerable to rising sea levels compared to coastal areas with less risk. Here, the balcony view from a luxury condo in Sunny Isles Beach, Fla., in 2017.

Rhona Wise/AFP via Getty Images

How much should you pay for a home that is likely to be inundated by rising seas in the decades ahead?

It’s a tough question — and an increasingly common one for homebuyers along the Florida coast. That’s according to new research that finds the risks of sea level rise appears to have begun affecting residential real estate prices in the state’s most vulnerable coastal areas.

The study’s authors — Benjamin Keys and Philip Mulder at Penn’s Wharton School — looked at the relationship between sea level rise and changes in real estate and mortgage markets over the last two decades.

They found that up until 2012, sales volume of homes in census tracts that were less exposed to sea level rise and homes in tracts more exposed to it were trending similarly. That is, the vulnerability of a census tract to sea level rise doesn’t seem to have affected how many homes were sold there.

But from 2013 on, the volume of homes sold in Florida’s coastal areas with more sea level rise exposure has fallen, as sales in the state’s lower-risk coastal tracts have risen.

Interestingly, it took longer for home prices to change. Prices of homes in both groups increased similarly from 2013 to 2016. But since 2018, prices in more-exposed tracts have started to fall compared to those that are less exposed – a difference of 5-10% in 2020.

The authors say this difference can’t be attributed to changes in lender behavior: the price change was similar in all-cash and mortgage-financed purchases.

So what happened around 2013, that perhaps caused homebuyers to start taking sea level rise into account?

The authors identify a few things. One, 2012’s Hurricane Sandy struck the East Coast in October of that year — an event that made flood risk very clear to Florida homebuyers from the Northeast. Two, the Intergovernmental Panel on Climate Change updated its worst-case projections in 2014, driving media coverage on the topic. Online searches in Florida for “sea level rise” began to increase.

And what accounts for the lag between the drop in home sales volume and the later price decline?

The authors say their findings appear to follow the same dynamics as a housing market bubble, in which sellers overestimate demand because they’re extrapolating from recent price increases. The sellers price their homes higher than buyers will pay, so sales volume drops before the prices do.

In this case, the authors say, sellers are underestimating how much they’ll need to discount the property in order to sell it to buyers anxious about the effects of climate change.

The study looked solely at coastal Florida. The tracts it labels as “more exposed” to sea level rise have more than 70% of its developed land that would be chronically inundated at six feet of sea level rise. The tracts labeled “less exposed” are those in which 10% or less of its developed land would see chronic flooding at six feet of sea level rise.

“At some later date, in the absence of substantial mitigation and infrastructure efforts, many Florida properties will be underwater,” the authors write. “Until then, homeowners and lenders face greater risk of extreme weather events, storm surges, and nuisance flooding. Our results suggest that fewer buyers are willing to bear these risks at current market prices, leading to a sharp fall in transaction volumes.”

Other studies have looked at the impact of rising seas on residential properties.

A 2018 study by the Union of Concerned Scientists found that by 2045 – or near the end of a 30-year mortgage issued now – sea levels are projected to rise enough that nearly 311,000 of today’s residential properties in the U.S. will be at risk of chronic flooding. Those properties are currently home to more than a half million people.

The states with the most homes at risk by the end of the century are Florida, New Jersey and New York, that study found.

And that approaching risk certainly complicates the math of homebuying.

“Not only are the mortgage loans on these homes at growing risk of default if the value of the properties drops, but each successful sale of one of these homes represents the potential transfer of a major latent financial liability,” noted the authors of the Union of Concerned Scientists report. “Eventually, the final unlucky homeowners will hold deeds to significantly devalued properties.”

A different study published in 2018 found that sale prices of homes likely to be underwater in the future were affected by whether people in that county believed in climate change or not: “houses projected to be underwater in ‘believer’ neighborhoods tend to sell at a discount compared to houses in ‘denier’ neighborhoods,” the authors wrote.

Of course the steps taken now and in the coming years will determine both how much sea levels rise, and how vulnerable coastal homes are to inundation.

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Newsrust: Is The Risk Of Sea Level Rise Affecting Florida Home Prices? A New Study Says Yes : NPR
Is The Risk Of Sea Level Rise Affecting Florida Home Prices? A New Study Says Yes : NPR
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