1. Using a participle:
* "The empty building was unsettling." (The participle "empty" describes the building.)
* "The building, found empty, was a source of concern." (The participle "found" describes the state of the building.)
2. Using a compound adjective:
* "The building's empty state was eerie." ("Empty state" acts as a compound adjective.)
* "The discovery of the building's emptiness was unsettling." ("Building's emptiness" acts as a compound noun phrase functioning as an adjective.)
3. Using a prepositional phrase:
* "The building, with its empty rooms, was a ghost of its former self." (The prepositional phrase "with its empty rooms" describes the building.)
Choose the option that best suits the context and desired emphasis in your sentence.