For example, can you have two rows on which you're building "red" tiles at the same time? (assuming of course that you haven't already placed a red tile in either row)
I think you can, but I wanted to be sure.
Also, if you're taking multiple tiles, can you split them up between rows or do they all need to go to the same row (and floor)?
First question: Yes
Second question, pre 'or': No
Second question, post 'or': Yes