understanding daily holding costs

[Ashley C.]

HI ya'll, newbie rehabber here. Am I missing something in my holding costs? Here's a sample project. Numbers fudged for easy math; using 360 day year/30 day month.

assumptions: borrowing $140K at 8% for 6 months; accrued
annual interest = $7k; $19/day
anticipated profit = $40K; $111 opportunity cost/day
vacant building insurance = $150/month; $1800 annualized; $5/day

accruing interest $19
opportunity cost $111
utilities $5
property tax $5
insurance $5
Total daily $145; total monthly $4,350