You may want to find out if the 140 unit limit at CSUN limits the number of units you can take as you approach 140 units, or is only applied after you reach 140 units.
I.e. if you have 139 units, will you be limited to taking the courses needed to graduate as soon as possible (since any course would put you at 140 or more), or could you take a full semester unrestricted by this policy (e.g. 15 units that could bring you to 154 units) before being allowed to take only the courses needed to graduate as soon as possible?
CSUN is not the only California public university that has a unit limit, although various campuses implement such things differently.