Question: Where are the headquarters of the company who owns Black River Plantation House?

Context paragraphs:
Green River Plantation: Green River Plantation is a historic plantation house on over 260 acres located near Columbus, Polk County, North Carolina.  The oldest section of the "Big House" was built between the years 1804-1807, and is a two-story, four bay, Late Federal style frame dwelling.  A later two-story, four bay, brick Greek Revival style dwelling was built beside the original structure in the mid-19th century.  The two sections were joined in the late 19th century by a two-story section and grand staircase to form a structure that is over 10,000 square feet in size and boasts over 42 rooms and spaces.  The plantation house was built by Joseph McDowell Carson, son of Col. John Carson, who built Carson House at Marion, North Carolina.  The later-built section of the home was the residence of Samuel Price Carson, North Carolina State Senator and U.S. Federal Representative, and younger brother of Joseph McDowell Carson.

Parlange Plantation House: The Parlange Plantation House is a historic plantation house at Louisiana Highway 1 and Louisiana Highway 78 in Pointe Coupee Parish, Louisiana.  Built in 1750, it is a classic example of a large French Colonial plantation house in the United States.  Exemplifying the style of the semi-tropical Louisiana river country house, the Parlange Plantation home is a two-story raised cottage.  The main floor is set on a brick basement with brick pillars to support the veranda of the second story.  The raised basement is of brick, manufactured by slaves on the plantation.  The walls, both inside and out, were plastered with a native mixture of mud, sand, Spanish moss and animal hair ("bousillage"), then painted.  The ground story and second floors contain seven service rooms, arranged in a double line.  The walls and ceiling throughout the house were constructed of close-fitting bald cypress planks.

Hampton Plantation: Hampton Plantation, also known as Hampton Plantation House and Hampton Plantation State Historic Site, is a historic plantation, now a state historic site, north of McClellanville, South Carolina.  The plantation was established in 1735, and its main house exhibits one of the earliest known examples in the United States of a temple front in domestic architecture.  It is also one of the state's finest examples of a wood frame Georgian plantation house.  It was declared a National Historic Landmark in 1970.

Umbria Plantation: Umbria Plantation, also known as the Samuel Pickens Plantation, was a historic cotton plantation and Greek Revival-style plantation house near what is now Sawyerville, Alabama.  The plantation was established by Samuel Pickens, the younger brother of Alabama's third governor, Israel Pickens.  The house was an unusual example of a raised basement plantation house built on a U-shaped plan.  It was recorded by the Historic American Buildings Survey during the 1930s.  It was destroyed in a fire in the early 1970s.

Quinby Plantation House-Halidon Hill Plantation: Quinby Plantation House-Halidon Hill Plantation is a historic plantation house located near Huger, Berkeley County, South Carolina.  The house was built about 1800, and is a 2 1/2-story, five bay, frame Federal style plantation house.  It sits on a low brick foundation and has a gable roof.  In 1954, in order to save Quinby Plantation from destruction, the owners moved it approximately four miles to Halidon Hill Plantation.  Halidon Hill Plantation is associated with the lowcountry rice culture and was historically part of Middleburg Plantation.

International Paper: The International Paper Company () is an American pulp and paper company, the largest such company in the world.  It has approximately 55,000 employees, and it is headquartered in Memphis, Tennessee.

Nottoway Plantation: Nottoway Plantation, also known as Nottoway Plantation House is located in White Castle, Louisiana, United States.  The plantation house is a Greek Revival and Italianate-styled mansion built by John Hampden Randolph in 1859, and is the largest extant antebellum plantation house in the South with 53000 sqft of floor space.

Black River Plantation House: Black River Plantation House, also known as Rice Hope Plantation, Black River; and International Paper Company House, is a historic home located near Georgetown, Georgetown County, South Carolina.  It was built in 1919, and is a 2 1/2-story, Neo-Classical Revival frame house.  It is clad in weatherboard and has a hipped roof.  The riverside façade features a portico supported by four columns with Corinthian order capitals.  The house was purchased by the International Paper Company in 1942, and used by company employees and guests as a resort.

Orton Plantation: The Orton Plantation is a historic plantation house in the Smithville Township of Brunswick County, North Carolina, United States.  Located beside the Cape Fear River between Wilmington and Southport, Orton Plantation is considered to be a near-perfect example of Southern antebellum architecture.  Built in 1735 by the co-founder of Brunswick Town, the Orton Plantation house is one of the oldest structures in Brunswick County.  During its history Orton Plantation has been attacked by Native Americans, used as a military hospital, and been home to lawyers, physicians, military leaders, and a Colonial governor.  Although the home is privately owned and closed to the public, the Orton Plantation Gardens and family-owned chapel have become a tourist destination in Southeastern North Carolina, attracting thousands of visitors each year.  On April 11, 1973, the Orton Plantation was added to the National Register of Historic Places.

Carroll Place: Carroll Place, also known as Old Carroll Place, is a historic plantation house located near St. George, Dorchester County, South Carolina.  Research completed circa 2012 at the South Carolina Archives in Columbia S.C. shows the house was built circa 1780, and is a plain two-story, Georgian I-house dwelling.  It is sheathed in clapboard single house and rests upon low brick pillars.  It has a hip roofed verandah supported by six wooden posts.  Its builder was likely Thomas Ferguson or David Campbell.  In 2008 the house was donated to the Dorchester County Historical Society by current owners Fitzhugh Lee Sweatman Jr and his wife, Martha Westbury-Sweatman.  The Dorchester County Historical Society under took an extensive restoration of the Colonial Era Plantation House and when completed, re-designated the house as the Koger-Murray-Carroll house for three of its previous owners who served in the South Carolina General Assembly: Joseph Koger (married the daughter of David Campbell and inherited the house on her death), Soule Murray (purchased the house and land from Joseph Koger), and James Parsons Carroll (purchased the property circa 1850).  James Parsons Carroll also served in the South Carolina Court of Equity as a Chancellor and was a signer of the South Carolina Ordinance of Secession.  Circa 1974 the house was added to the National Historical Register of Places as the "Old Carroll Place" for which it had become known.  The last owner/occupants of the house were the late Fitzhugh Lee Sweatman Sr and his wife Eulalie Knight-Sweatman.  Circa 1970 Mr and Mrs. Sweatman Sr built a smaller one story house off to the side of the Plantation House.  Mr. Sweatman Sr died on the property in 1975.

Supporting paragraphs: Black River Plantation House International Paper
Answer: Memphis, Tennessee