Problem with creating faces after I've flatten lines

I’ve been making this site layout of a part of a city from a cad file I imported and there are still some lines that won’t separate the faces (the ones in bold). I have already revealed the hidden geometry and checked the line intersection but nothing seems to be working. I have already flatten the lines and retraced the lines but nothing seems to work.
Hoping for a quick solution.
I’ve attached the file.
CONTEXTO INM.skp (402.8 KB)

See this SU file for a corrected one. Tomorrow I will try to explain how I did it.

CONTEXTO INM - JL.skp (605.0 KB)

In the mean time, turn off the automatic snapping in Model Info → units.

Thanks its perfect!