Some excerpts from Parachutist skill's description. "The player may deploy the Trooper on any surface of the game table, as long as that surface's size is equal to or larger than their base and is in contact with the edge of the table." If there is a building that is in full contact with the table edge, can I place the Trooper using the Parachutist skill on the contact surface of the table edge and the building? Attached is the picture below for detailed explanation.
I think the presense of balcony is important here. Parachutist entry is possible if there isn't a balcony and not possible if there is. Note that if the table creator wants to enable parachutist insertion to that particular spot, he can put the balcony part of the building just outside of game area.
Still the same in my eyes: if you can place the model in BtB contact with the black line of the table edge, you an place a Parachutist there. On a roof of a building, on a balcony around the building, even inside of a building - as long as it is in BtB with the table edge...
I always understood the limit for parachutist like a "2D skyline", so for me I have it always clear and nobody have ever disagree with that kind of interpretation, at least not until now. However, yes, it is something maybe could need some clarification.
As long as the building or balcony in contact with the table edge has no parapet on the play area side of the table edge it's possible to deploy on them.
Your placement of the parachutist in the diagram is perfectly acceptable. It's on a surface that is equal to or larger than its base and its base is touching the table's edge, therefore it meets all criteria. Your diagram also works if you were asking if the parachutist could land inside this building, so long as it was agreed earlier that the building's interior was playable space.
I was assuming that there was (larger than zero with width) parapet on a balcony, but you are right the example doesn't specify that. What I have understood that the act of placing parapets so that they touch the table edge is a intential parachutist block from the desginer of the map.
I think sometimes it is intentional while sometimes just want the building there without any consideration of parachutist (like a table in a tournament that everything has to fit within 48’). I think discussing with the opponent is best as we do for LoF beneath vehicles or gaps between stair steps. However, I would allow my opponent to deploy a parachutist there if the parapet is less thicker than usual mdf building thickness.