For example, who pays for fixing the front patio roof if the roof is a continuous roof for 6 adjoining row houses? 

Hello Justin,A 15 unit apartment is too small for a commercial ALF operator and its not a "home" for the Residential model.  

They both fix things,  but why change specialties?

Unless you plan on doing all the work yourself, you should factor in termite inspection/prevention, possible tree removal/trimming, clearing gutters to prevent leaks, sending contractors to fix things that break, painting unit after each tenant, changing locks after each tenant, cleaning, appliance maintenance etc. 

Its up to you and what fits your business model and want your business to look like 

Can the rates increase at a dangerous rate since they aren't fixed?

It took four different technicians and about 5 weeks to finally fix it fully.

Some have actually even done worse damage to the item they were sent to fix. 

I was just curious if you could please share your wisdom about how to find properties for fix & flip.

hello, I have just bought a property that needs a) fumigation (section 1), b) landscape grading to improve drainage, c) crawspace/foundation work to repair some piers and fix sump pump, and d) minor interior remodel and retrofit window.