摩天大厦 (mótiān dàshà) · skyscraper, high-rise tower

Reads literally as 'rub-sky big-building.' 摩天 'rub-the-sky' is the old Chinese rendering of skyscrapers' altitude - the same image English uses, just with rubbing instead of scraping. You'll see 摩天 in 摩天轮 ('Ferris wheel,' literally 'sky-rubbing wheel').

mistakes

Pronounce 厦 as shà here, not xià. The character is shà when it means 'mansion/tall building' and xià only as part of 厦门 (the city Xiamen). Saying mótiān dàxià sounds like a learner error to native ears.