https://www.csun.edu/admissions-records/transfer-course-information says that “Only 70 units from a community college can be applied to the total units toward a CSUN degree.” Note that non-transferable course work does not count in any case.
https://www.csun.edu/undergraduate-studies/administrative-graduation describes the 140 unit limit – basically, a student with >140 units must graduate if s/he can, or else is limited to courses needed to complete the major for which s/he has already completed the highest percentage of requirements. Not sure how allowable would be to finish a semester with 139 or 140 units and then take a final semester of 15+ units before graduating.
So you have at least 70 units of headroom. Can you complete all of the courses you want at CSUN within 70 units?