It's about one-two-hundred-fiftieth as heavy as The Sears Tower
In other words, 749.50 tonnes is 0.00371 times the weight of The Sears Tower, and the weight of The Sears Tower is 269.3 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800 tonnes. 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 300 times as heavy as The Tongue of a Blue Whale
In other words, 749.50 tonnes is 280 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 0.004 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2.7 tonnes. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.
It's about 350 times as heavy as a Rhinoceros
In other words, 749.50 tonnes is 360 times the weight of a Rhinoceros, and the weight of a Rhinoceros is 0.003 times that amount.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2.10 tonnes. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about 400 times as heavy as a Giraffe
In other words, 749.50 tonnes is 388 times the weight of a Giraffe, and the weight of a Giraffe is 0.0026 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 1.930 tonnes. Reaching 5.5 m (18 ft) in height by adulthood, giraffe calves can grow as much as 3 cm (1 in) per day.
It's about one-four-hundred-fiftieth as heavy as The Empire State Building
In other words, 749.50 tonnes is 0.0023 times the weight of The Empire State Building, and the weight of The Empire State Building is 442 times that amount.(New York City, New York)
The Empire State Building weighs approximately 331,000 tonnes. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 450 times as heavy as a Car
In other words, 749.50 tonnes is 453.7 times the weight of a Car, and the weight of a Car is 0.00220 times that amount.(for 2009 Ford Taurus) (curb weight)
A 2009 Ford Taurus weighs 1.6520 tonnes. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 0.3860 tonnes.
It's about one-one-thousandth as heavy as The Golden Gate Bridge
In other words, 749.50 tonnes is 0.00093 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 1,070 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 805,000 tonnes. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.