IPA: /ˈmʌltiˌstɔːri/
KK: /ˈmʌltiˌstɔri/
Referring to a building that has multiple levels or floors.
The new apartment complex is a multistorey building with 20 floors.
Multistorey → It is formed from "multi-" (meaning many) and "storey" (from Old French *estage*, meaning a level or floor in a building). The word "multistorey" refers to a building that has many levels or floors.
Think of 'many' ('multi-') levels or floors ('storey') in a building — that's what multistorey means.
No commonly confused words.