It's about three-fifths as heavy as The Sears Tower
In other words, 259,950,000 pounds is 0.5843 times the weight of The Sears Tower, and the weight of The Sears Tower is 1.711 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 444,900,000 pounds. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about one-third as heavy as The Empire State Building
In other words, 259,950,000 pounds is 0.356 times the weight of The Empire State Building, and the weight of The Empire State Building is 2.81 times that amount.(New York City, New York)
The Empire State Building weighs approximately 730,000,000 pounds. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about one-tenth as heavy as The Golden Gate Bridge
In other words, 259,950,000 pounds is 0.146 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 6.85 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 1,770,000,000 pounds. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about one-fiftieth as heavy as The Great Pyramid of Giza
In other words, 259,950,000 pounds is 0.0 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 50 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 13,000,000,000 pounds. The 2,300,000 stones used in the construction of the pyramid weighed an average 5,000 pounds and were quarried from distances of up to 805 km (500 mi) away.
It's about 0.00000000000000002 times as heavy as The Earth
In other words, 259,950,000 pounds is 0.000000000000000019739 times the weight of The Earth, and the weight of The Earth is 50,661,000,000,000,000.000000000000000000000 times that amount.The mass of the planet Earth is 13,169,999,999,999,999,945,474,048.000000000000000000000000000000 pounds. The element iron makes up about 32% of that mass, or 4,227,400,000,000,000,132,120,576.000000000000000000000000000000 pounds.
It's about 0.00000000000000000000006 times as heavy as The Sun
In other words, 259,950,000 pounds is 0.000000000000000000000059 times the weight of The Sun, and the weight of The Sun is 17,000,000,000,000,000,000,000.000000000000000000000000 times that amount.The sun has a mass of 4,400,000,000,000,000,452,283,919,107,096,576.000000000000000000000000000000000000 pounds which represents 99.9% of the solar system's total mass. 98.7% of the sun's mass consists of hydrogen and helium — respectively the lightest and second-lightest elements in the universe.