Cap Ex as a Hard Number

I don't figure Cap Ex as a %. Add up the cost to replace everything over the next 30 years, then divide by 360 and add some padding. That is a safer way to figure Cap Ex.

Condos are probably going to be cheaper. As the HOA should take care of most of the external Cap Ex items. You are still going to have to replace:

CONDO

Oven, Fridge, Dishwasher, Microwave 3x

Drywall 1x

Floors 2x

Countertops 1x

Water heater(s) 2x

Paint 4x

Furnace(Maybe) 1x

FOR SFH and MFH ADD

Roof 1x

Siding 1x or Paint 2x

Furnace(Definately) 1x

Your repair budget should take care of most of the dents and nicks that will accumulate.