@susi2
Sky, like most ISPs, doesn't actually lay its own fibre. Assuming you are in the UK, the national telecoms network is installed and maintained by Openreach, and the FTTP rollout is their project.
The issue for a high rise is typically the in-building cabling, which requires Openreach to negotiate complete access with the building owner: it's not economically viable to do such work piecemeal.
Putting the address into the BT Wholesale Availability Checker should indicate which broadband provisioning type is available.
https://www.broadbandchecker.btwholesale.com/#/ADSL/AddressHome
It's the table and the two text lines below it which are most useful.
Remove any personal information (such as the address itself) if you post an image.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
