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You just need to militarize your balcony with Python: https://www.youtube.com/watch?v=QPgqfnKG_T4

Have someone bring over their falcon every now and then: http://www.airstrikebirdcontrol.com/

You can try with a plastic or resin bird of prey figure.

Have you tried a feline alarm system? Worked for us.

Thanks. I'd like to give that a try. Do you have a link to the type of model that has worked for you?

I'd get one used or second hand, since they tend to be better at detecting the birds.

sure, but 'feline alarm system' is kind of vague - what type or model worked for you?

My mom bought a weak super soaker and has been spraying pigeons with water, she says it works.

Not sure I'd recommend it.