If the kitchen needs an upgrade or the bathrooms, or flooring then you could add value to the house and potentially cash out refinance or get a HELOC based on the new value and use that for more upgrades.

Look at the property when you buy it to see what the estimated shelf life will be for major items like roof, HVAC, floors, Kitchen, driveway, etc... 

I initially paid out of pocket for most of the interior updates / rehab costs when the family moved in, but now it could use new roof shingles (which we've got estimates on) and some minor updates in the kitchen and garage.

Why not kitchens and dining rooms?   

electrical upgrades , plumbing,kitchen, roofing, shower, sewer,windows, doors, appliances.. plus I add the first 6month on the loan.My concern is that $18k as leftover in the escrow it should go back to the principal and I only  got  $15K the bank said that the rest is towards mortgage payments… ??? 

There is also a 1x per month count of kitchen items conducted by facilities manager and restock of cutlery, plates, cups etc.

And while that depreciation may be disguised by inflation, or area price increases, money does need to be spend as systems such as HVAC need replacement, roofs need to be replaced, and capital expenditures such as kitchen remodeling are needed for the asset to be rented at a profitable rental rate.

Now if I remodel the kitchen, bathrooms, doors, windows and some other stuff I could probably rent it out for $650-$700, increasing my cash flow, specially when I move out.

There are two kitchens as well.

Purchase price: $116,000 Cash invested: $27,000 Sale price: $187,500 Replaced kitchen, updated bathroom, drywall repairs, paint and flooring.