Texas-based Energy Transfer Partners bought the land last month for an undisclosed price.
Morton County authorities did not return telephone calls Tuesday seeking comment on the company's statement and whether it affected the plans to not immediately remove the protesters.
The protesters argue the land rightfully belongs to Native Americans under a more than century-old treaty.
Protesters fear the pipeline project could potentially cause irreversible harm to the drinking water for the Standing Rock community - who live just one mile from the river - as well as the river's ecosystem.
Authorities also fired upon a protester's drone Sunday, which the sheriff's office said was flying directly above deputies in violation of Federal Aviation Administration rules. The company said it would transfer ownership of the land or use it "for some other use" that complies with state law after the pipeline is built.
Former Vice President Al Gore says he supports the Standing Rock Sioux Tribe in its opposition to the Dakota Access oil pipeline.
Actress Shailene Woodley is to stand trial in North Dakota early next year on charges related to her protest against the Dakota Access pipeline.
The Standing Rock Sioux Tribe is suing the Corps over permits issued for the four-state pipeline, which would carry 470,000 barrels of crude oil per day.
Authorities arrested 126 people Saturday on charges including reckless endangerment, criminal trespass, engaging in a riot, assault on a peace officer and resisting arrest, bringing the total number of arrests to 269 since August 10.
"There's a very large group of protesters (who) walked from Highway 1806 to the site", said Preskey, adding that all available officers were called in to respond.
Protests have been ongoing in the area for months, but the latest move marks the first time demonstrators have moved directly in the project's path.
Morton County Sheriff Kyle Kirchmeier said, "Individuals trespassing on private property can't claim eminent domain to justify their criminal actions". The local sheriff's office called it trespassing, but said it wouldn't immediately remove the more than 100 people because it didn't have the manpower.