Steel Threaded Pipe/Compression Fitting Replacement
It looks like you will need to replace the entire hose. I've never seen one quite like the one in your picture and I can't tell what the connection type is at the other end, but this site might help you determine what you have/need: Stainless Steel Corrugated Hose for Faucet.

As far as shutting off the water to the entire building; there’s typically a shutoff valve at the wall, or at minimum a separate water shutoff for just your condo unit. There should be no need to shut off the entire building.