These factors include if you are a biz owner or not and if that business is a real estate related one.

Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

DealMachine has started including contact data without having to pay for skip tracing.

It’s still a worthy strategy to force cash flow that’s rare to find in SoCal, especially if you can reduce the cost of construction by doing a conversion/using an ADU grant or even buying a property with an existing ADU In general, even if the ADU valuation matches your cost including grants, they are usually not worth it in southern CA in single family zones. 

Their advantages include house hacking which includes better finance options and hustle.My last purchase was so large cash negative that the rents were $3k less than PITI.  

This would include adding another bedroom and making it a full 2 bath.

The important things to consider about HOA fees is that they usually include some utilities: Water/Sewer, Trash, sometimes shared amenities like gym, clubhouse, pool, and they are saving you the time and headache for property maintenance: lawn care, tree timing, roof, siding, etc.

I keep scans or pictures of all of all letters I send this way including the letter as readable before it goes into the envelope which includes the tracking number written on the letter, plus the filled out certified mail paper and the envelop after its addressed. 

Or the listing agent includes it in the property info on their website, or shares it when a showing is scheduled.

Politely and clearly, make it extra clear that all information will be verified including income prior to the signing of any lease.