A developer is asking Miami-Dade County to approve an $83 million bond for the construction of a student housing complex on Florida International University’s Biscayne Bay Campus. National Campus and Community Development Corp. and Biscayne Properties agreed to lease a 4.75-acre site from FIU and built a nine-story complex with housing for 615 students. It would total 290,000 square feet. At the May 13 meeting of the Miami-Dade County Commission’s Finance Committee, commissioners will vote on whether to let the developer seek funding through the county’s industrial development authority bonds. The advantage for the developer is that it would be tax free.