21st floor? Hmm. Well, I think you're either going to have to make use of that balcony somehow OR you're going to have to set your alarm and GET YOUR ASS UP EARLY every day and take your dog outside BEFORE it's too late and he's pissing on carpets etc.
Scold him when he pees indoors, praise him when he does it where he's supposed to (outside). Do that consistantly and it shouldn't take long for him to get the drift and start "asking" to go outside (by going to the door, coming to you and whining, etc)
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