The Alabama real estate firm that recently sold a Downtown tower to CSX Corp. has picked up an office/warehouse center on Philips Highway for $21 million.

Graham & Co. of Birmingham, Alabama, bought the Interstate South Commerce Center from Unum Group and United of Omaha Life Insurance Company, according to a deed filed Friday with Duval County.

The 34,000 square-foot building has 4,290 square feet available, according to sales information on Graham & Co.’s website.

The 25-acre site has six buildings, according to the Duval County Property Appraiser, and an assessed value of $17.55 million.

Unum Group and UM Holdings IV took over the property from Windsor at Interstate South LLC in 2011, according to county records. Windsor had purchased the property for $29.7 million in 2007.

Early in December, BP Graham — an Alabama-based investment company that includes members of Graham & Co. and other investors — sold the 14-story office tower at 550 Water St. to CSX for $30 million, according to city records.

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