Philadelphia-based W.G. Yates & Sons Construction Company — the local construction manager for the Lauderdale County Courthouse — will build two prototypes of President Donald Trump’s proposed border wall.

U.S. Customs and Border Protection on Thursday issued a news release announcing contract awards to Yates and three other companies. Each company will build one alternate-material prototype wall.

On Aug. 31, Yates was among four companies selected to each build a concrete prototype wall.

Yates is the largest construction company in Mississippi. The 53-year-old company has received more than $560 million in federal contracts since 2007, according to The Center for Investigative Reporting. 

According to the business’s website, the company provided construction services for the U.S. Border Patrol Station project in Eagle Pass, Texas, a 1,300-square-foot station that monitors 56 miles of the Mexico-Texas border. Yates’ work also covers the areas of “arts and culture, civil, commercial, education, entertainment and gaming, federal, healthcare, hospitality, manufacturing, municipal, retail and technology,” according to its website. 

Numerous phone calls to Yates’ office were not returned.

Altogether, the eight wall prototypes will cost $3.6 million and will be built in San Diego, probably this fall.

According to a report from NPR, the Department of Homeland Security has estimated the cost of the wall at $21 billion. An MIT study puts the price tag at $38 billion.

According to the CBP release, the prototype walls are expected to have “robust physical characteristics” and be between 18 [and] 30 feet high.”

The other three companies selected to build the alternate-material prototypes are Caddell Construction Co., (DE), LLC, of Montgomery, Ala.; KWR Construction, Inc., of Sierra Vista, Ariz.; and ELTA North America Inc.. of Annapolis Junction, Md.

Companies selected to construct the concrete border wall prototypes are:

Caddell Construction Co.; Fisher Sand & Gravel Co./DBA Fisher Industries, Tempe, Ariz.; and Texas Sterling Construction Co., Houston, Texas.

The wall was a hot-button issue in Trump’s campaign last year. He promised that Mexico would pay for it, but Mexico has refused. He is pushing Congress to fund it, but faces strong opposition from Democrats.

The Associated Press contributed to this report.