Viability calculator

fire_pct circ_frac door_cost occupancy common_psf amort_years opex_psf_yr permits_pct elec_per_zone hvac_per_zone wall_overhead plumb_per_zone contingency_pct elec_per_studio hvac_per_studio net_studio_sqft trim_per_studio kitchen_per_zone utilities_psf_yr wall_cost_per_lf zone_target_sqft svc_sqft_per_zone wall_lf_per_studio floor_finish_per_studio