From there you can start to identify what you are looking for.Where do you land on the follow spectrums:Cash flow and AppreciationLong term or Short term needs (waiting for growth vs get out of my W2 now)Long term rentals, Mid term rentals, Short term rentalsBuying close to home or coast to coastSelf manage or hire a PMIf you can narrow in on those, you essentially have your buy box. 

I regret not hiring a GC as I acted as my own.

I would be hiring people for the cleaning, maintenance, etc. 

There is typically one or more heir that feel he or she deserves more then all the other heirs because the took care of auntie or uncle and  hires an attorney to contest the probate.  

A good ballpark is $1,000–$2,500 per unit, but this depends heavily on how extensive the turnover is and whether you’re self-managing or hiring contractors.If you’re looking for more precision, connecting with local property managers or contractors can provide insight into typical costs for properties like yours in the area.

No offense, but hire a PMC because:1) You hate the process of placing tenants.2) You didn't do a very good job of screening the current ones.Sometimes we have to get out of our own way to find success!

.: I just hired an architect to design and plans submit for ADU in my 8 multi unit to use the tuck under parking.Some people say do not try to be the general contractor as it will take way more time, costly mistakes and will be nearly impossible to manage with current work. best to hire a company that will do it all and cost about $250 per square foot.

If you have an issue with that, or are long distance, hiring a property manager is a must.

So this involves hiring an architect draw up plans ($1,000 - 3,000 if I had to guess).  

Then hire one that sounds competent and that you can get along with.