Columbia Student Housing FlexRent: Upfront Payment FlexRent Admin Fields Lease Status Active Lease Type Monthly Payment Pre-Paid Residency Type rTx01b rTx02c rTx04e rTx0a Date We created CSH FlexRent options and this monthly rent calculator to help plan your housing budget. Here, you can calculate how to lower your monthly rent cost based upon making an upfront payment. Click the button below to select housing preferences from the currently open rent schedule. If you are human, leave this field blank. Select Semester and Room Type