Cleveland investors often aim for COC returns of 8–12%, so you’re in the right range.Net Cash Flow: $277/month is positive and provides a buffer for unexpected expenses.

Planing on starting buying my first multiplex -6-8 unit  and another one every 6 month 

If you’ve had a mortgage for 20 years and they stopped reporting your payments 6-12-18 or even 24 months ago.

Not sure when you purchased the property, but keep in mind conventional loans require 12 months of seasoning before you can use the appraised value for a cash out refi.

So, you would only be able to take about four months of depreciation for this year.However, the bonus depreciation is not prorated.

Without substantial renovation or repair / forced equity, I doubt that since almost 12 months ago you have enough to do a DSCR cash out refi.

If your budget is so tight that you can't handle a small leak, what will happen when a tenant fails to pay the last month of rent and abandons the property with $6,000 in cleaning and repairs?

I would look for a bunch of Sub To Deals with 2-3% interest rates ...... then rent out for cash flow and huge equity build up when rates are really low (check out amortization schedules and compare 2-3% vs 6-7% with the same balance and length of time - check out the principal portion each month - the lower the rate the higher amount goes to principal PLUS better cash flow).

If you have a tenant that doesn't pay and you have to evict, you might lose 3 to 5 months of rent payments plus have make ready costs of 5k to 6k depending on what they do.   

X a month sounds a lot better and is actually doable for a lot of people vs a big pile of cash today if you need a full cash sale.