I will start looking out for 4 unit apartment to enable  me qualify for the FHA loans with a Down payment of 3.5%What is the % of my monthly fees on mortgage , taxes  and utilities if the apartment cost about $300000 and if the monthly rent of the 4units apartment is $3000  since I already know that %10 of the gross income go to the property management monthly and again.

If you're looking to extract more than a few grand, you're looking for too much.

I believe it's because many landlords want to passively extract money for communities and don’t want to contribute their pro-rata share towards advocating for the neighborhood.

For flipping, I'd strongly consider electing to be taxed as an S Corp, as it will enable you to pay out some of your profits as distributions, avoiding the 15.3% tax of self-employment income.

Hire a talented manager and make sure that you're extracting maximum revenue from the remaining holdings. 

It doesnt really matter if they are enabling you to make money.HA/VRBO keeps my calendar full and makes me money.

If so, sometimes condos can be challenging as investor owners often don't want to do upgrades and updates, many just want to run the property into the ground and extract as much cash as they can get today, without thought to the future.   

On the other hand, it may be simpler and straightforward to break into individual accounts, but that could become a headache as well.Ultimately, I think it all depends on how organized you are or want to be, and the best method you see to enable that.

Some of them are WiFi enabled so I'm not sure how that fits in with your situation.https://leaksmart.com/

One of the snags I see with your plan is taking forever to get enough equity to extract for a down payment on a home in California.