Doors That Divide the Sukkah

A balcony that is divided by a glass partition that opens into three doors: is the entire area considered one sukkah? The practical ramification is that half of the balcony is enclosed with three walls, while in the other half there is a railing and it is necessary to rely on the law of lavud. If it is considered one unit, may I use the walls of the enclosed room?

Shalom u'vrachah 

As long as the glass doors are closed, the wall is the doors, and therefore the outer section will need to be valid as a sukkah on its own. 

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