Bike Storage: Wall mounts, stands, lock-ups, sheds, etc.

Maybe a bit big for your balcony but having recently moved to the in-laws, i got a 'Bikecave' from tidytent and it is solid and holding up to the snow in north east scotland

Any motorbike cover is good for large/multiple bikes. I have one for my tern GSD.

Something as nice as those should be inside the flat :(

make sure you chain them up well - thieves climbing to retrieve bikes from high balconies isn't unheard of!

Very nice bikes - not seen those beaky saddles before.
Have you been honest with the boss about their value I wonder ;)