Is the sentence correct?

Stylistically, I'd put commas between "strong" and "genuine," and between "spare" and serviceable."

I'd find one word to replace the two adjectives "strong, genuine."

Chow I'd agree with Infra about the first comma but not necessarily about the second. Otherwise (largely guesswork),

This office had never explored any(?) other options on the use of the vacant kiosk but there is we do have a strong genuine need for having a proper store room for our to keep store spare serviceable clubhouse leftovers such as horticultural equipment

Eliminate "strong" and "serviceable."

Sage I sorta disagree about the latter. I can suppose some of the spares are serviceable but some not, yet we'd like to store 'em all. More spare parts...

Chowbarry, your sentences are usually overwritten.

Simpler is better.

Options for use of the vacant kiosk were not reviewed in the past. Our clubhouse needs a storage room for spare equipment, including that used for horticulture.

Wow Chow, Beth really chops 'em down

Why, for example, would you store a spare tire if it was flat? "Serviceable" seems like an unnecessary distinction.

Probly in general you're right Sage. However, there's a remote probability that context might have made this distinction necessary