Well maybe you didn't understand my question. Apartments don't have a recycle ability. I was talking about the recycle ability of cards, like for example Station's ability to recycle and earn one point. Once Station is in the discard pile can you get the extra point from recycling every turn or just once? I understand that when you recycle a card you don't flip it.
You are correct, Apartments do not Recycle - they Flip again.
When you recycle a card, you do flip it back to its original side. Therefore you can only Recycle a card once per time you Flip it.