CoStar Group Analysis Reveals 27% of Houston's Commercial Real Estate May be Flooded

WASHINGTON, Aug. 31, 2017 /PRNewswire/ -- CoStar Group, Inc. (NASDAQ: CSGP), the leading provider of commercial real estate information, analytics and online marketplaces assessed the potential impact Hurricane Harvey could have on the Houston commercial real estate market – multifamily, office, retail and industrial buildings - and found that 27% of the gross leasable area may be flooded.  This represents $55 billion in property value.  More importantly, some 72,000 apartment units sit within the 100-Year floodplain, and are likely to be flooded today.

CoStar Group (PRNewsFoto/CoStar Group, Inc.)

"Unfortunately, the number of displaced residents could be far larger than current media reports indicate," said CoStar Group Founder and Chief Executive Officer Andrew Florance.  "Our property by property review of the apartment buildings in the floodplain reveals an outsized share are low to moderate income households, including those in Southwest Houston where the bayous have overflowed."  

In total, there are 12,000 properties with 400 million square feet of space that fall within the 500-year floodplain.  Only 9 million square feet of space, including 4,000 apartments are within a designated floodway and most are probably inundated with floodwaters today.  However, 175 million square feet located in the 100-year floodplain, including 72,000 apartment units and 20 million square feet of office space, are likely seeing water incursion today.  Another 225 million square feet sits in the 500-year floodplain and is also at some risk of flooding.

"Of the $55 billion at risk, $16 billion are apartment buildings in the 100-Year floodplain," said Florance. "As soon as CoStar is allowed, we plan to do an air survey to assess the damage." 

The submarket that will be most affected is likely to be Southwest Houston.  This highly dense section of Houston is home to more than 66,000 apartment units, of which nearly 30% are estimated to be impacted.  Within Southwest Houston, the Braeburn, Greater Fondren and Sharpstown neighborhoods have the highest number of units that are in the 100-year floodplain. Each of these neighborhoods borders Brays Bayou, one of the river ways that snakes through Southwest Houston and has overflowed because of the torrential rain.

An additional five million square feet of space is under construction within the floodplain, including 3,144 apartment units. This represents about one-fifth of the 25 million square feet of commercial real estate under construction in Houston (which includes more than 12,000 apartment units).  Most of the apartment buildings (1,170 units) under construction within the 100-year floodplain are concentrated near the Medical Center. The most impacted office submarket is Greenspoint, which has elevated vacancies after the departure of Exxon Mobil in late 2015.  Here, some 3.5 million square feet falls within the 100-Year floodplain.

To view the map or list of potentially affected properties visit

About CoStar Group

CoStar Group, Inc. (NASDAQ: CSGP) is the leading provider of commercial real estate information, analytics and online marketplaces. Founded in 1987, CoStar conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of commercial real estate information. Our suite of online services enables clients to analyze, interpret and gain unmatched insight on commercial property values, market conditions and current availabilities. LoopNet is the most heavily trafficked commercial real estate marketplace online with over 5 million monthly unique visitors per month.,,, Westside Rentals and form the premier online apartment resource for renters seeking great apartment homes and provide property managers and owners a proven platform for marketing their properties. Through an exclusive partnership with Move, a subsidiary of News Corporation, is the exclusive provider of apartment community listings across Move's family of websites, which include®, and  CoStar Group's websites attracted an average of over 37 million unique monthly visitors in aggregate in the second quarter of 2017. Headquartered in Washington, DC, CoStar maintains offices throughout the U.S. and in Europe and Canada with a staff of over 3,500 worldwide, including the industry's largest professional research organization. For more information, visit

This news release includes "forward-looking statements" including, without limitation, statements regarding CoStar Group's expectations or beliefs regarding the future or future events. These statements are based on CoStar Group's current assessment of the potential impact Hurricane Harvey could have on the Houston commercial real estate market based on information available to CoStar Group and include estimates. These statements are based upon current beliefs and are subject to many risks and uncertainties and actual results could differ materially from these statements.  All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements, whether as a result of new information, future events or otherwise. 

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SOURCE CoStar Group, Inc.

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