Are you looking to add central ac or just buy some window units to stick in?

There's a rule (not sure what it's called) but multiple pulls on your credit within a 30-45 day window (not 100% sure on the time frame) can count as one credit pull instead of multiple.

This could be any number of things from egress, fire separation, minimum bedroom sizes, window access and adjacency to adjoining lots/property, etc. 

We now have a number of units purchasing cameras to capture the drug sales - literally people walk up to the bedroom window to buy. 

Signs of distressed property includes 1) tall or dead grass, 2) boarded up or broken windows, 3) overfill of mail and newspapers, 4) code enforcement signs, 5) overgrown vegetation, and 6) deferred maintenance.If you're looking for quick turnaround then I suggest you buy a list from Listsource.

Best yet the family that rented from me works for a national window company and installed new windows for me (free of charge).

That difference changes your strategy and your ultimate goal significantly.A 10 year window of time does too.

It is an older home and the most recent tenants have left it in a sorry state - it needs new carpet, paint, doors, windows, shower.

Should I get them for every window?

Here's the quick overview of my numbers and projections with more detail in screenshots of my excel spreadsheets:Purchase Price:  $365,000Price Per Unit:  $60,833Two-Family:  $121,667Four-Family: $243,333Rehab Estimates:  $60,000 ($10K/unit) Estimated After Repair Value:  $575,000Loan:  90% LTV (of purchase price) @ 12% interest for 6 months with 2 points paid on exitProjected Cash-On-Cash Return:  29.35%Projected Internal Rate of Return:  51.02%Here's a picture of the current rent roll (two units were vacant) and my projection of the rent rollCurrent Rents:  (more details considering the numbers don't tell the whole story)Two-FamilyUnit 1 (2BR+):  VACANT - son-in-law lived here and moved out prior to closingUnit 2 (2BR):  VACANT - empty when I walked it... he was "finishing" itFour-FamilyUnit 1 (2BR):  $200/week H&HW included - one bedroom is painted entirely black, multiple windows are broken, and other weird things...Unit 2 (1BR):  $780/month H&HW included - only "normal" tenant in the buildingUnit 3 (Studio):  $150/week H&HW&E included - complete hoarder... floor to ceiling with junk except for a small path from his bed to the bathroom and the fridgeUnit 4 (Studio):  $155/week H&HW&E included - smokes in her apartment without a care in the world... had a lit cigarette while I was walking throughProjected Rents:Two-FamilyUnit 1 (2BR+):  $1,400/month (OWNER-OCCUPIED) nothing includedUnit 2 (2BR):  $1,200/month nothing includedFour-FamilyUnit 1 (2BR):  $1,200/month H&HW includedUnit 2 (1BR):  $1,100/month H&HW includedUnit 3 (Studio):  $1,000/mo H&HW&E includedUnit 4 (Studio):  $1,000/mo H&HW&E includedHere's how the numbers broke down for cash in and cash out:Actual and projected expenses for the properties (I was given a single sheet of paper with hand-written numbers).