I am about to purchase my first 4 plex. Currently have 3 single fam rentals...I am at a point where I really want to take my portfolio up a few notches. I have a goal of reaching 100 doors at an average of somewhere between $150-$250 per door. I think with the right strategy and partners in place I can make this happen over the next 5 years or so. Does anyone here have a similar rule of thumb for what they expect to get per door? If so would you mind sharing what percentage you factor in for cap ex? (roof, siding, hvac replacement in long run)

The 4plex I am purchasing is priced at 155k...rents are at 2200...doesn't need any immediate work or repairs.