Because the real estate market is sluggish, Tokyo landowners are in a panic.

Literal

Real-estate market [subject-が] stagnating [because of-ため], Tokyo's land-owners [topic-は] panic [object-を] are-causing [polite-います].

不動産市場 = 'real estate market.' 低迷している = 'is stagnating.' 恐慌をきたす = 'to cause/experience panic.' Dense financial vocabulary.