Business Bay tower: the glass and façade glazing needs attention — what's actually different up in a high-rise?

Up in a tower the glazing is a system — sealed units, gaskets and the façade — and the fixes split cleanly once you know which is which. The good news: most of what you're describing is a repair, and the misted pane and whistling are the easy, owner-side ones.

Taking them in order: - Foggy/misted pane: the sealed double-glazed unit has failed and moisture has got between the panes. You can't 'de-fog' it — you replace the glass unit, not the whole window. Usually an owner-side fix inside your unit. - Whistling + dust: perished glazing gaskets and seals. Re-gasketing and re-sealing restores it — cheap, and again your side. - Dull external glass + the façade: here's the key difference from a villa — the outside face and the building's curtain-wall/façade are usually the building's/OA's responsibility, not yours, and reaching it needs specialist access (rope access or a cradle) with permits and insurance. Don't let a random company abseil your tower; that's the building's managed contractor. - Performance: if you're replacing units anyway, spec low-E glass — it cuts the solar heat that makes a Business Bay office expensive to cool.

So the order is: sort out who owns what with the building management first, get the misted unit and gaskets done on your side (interior access, straightforward), and route anything on the external façade through the building's access contractor. For the interior glazing and unit-replacement work in Business Bay, that's standard; the façade is the coordinated, permitted job.