Final answer:
The clearest passage is option (b), stating that developers want to build on vacant land and the community objects to this use.
Step-by-step explanation:
The passage that expresses the idea most clearly and concisely is: "Real estate developers want to build residences and offices on some vacant land in our town. The community objects to this use of the land." This option, choice (b), accurately conveys that the developers have specific plans for the land and that the community's objection is directly related to those plans, without any grammatical errors or redundancies.