They are full size and yet still run off 120v and just need a water source and drain. 

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.

Put your best foot forward.For a water front house I always lead with the water.For you it could be the arcade room. 

And as investors we should know this, but always anticipate higher costs and longer waits.EXAMPLE Breakdown of Costs:Plan Purchase: $1,500Permitting Fees: $2,500-7,500Site Preparation (grading, utilities, foundation): $20,000–$30,000ADUs require separate utility connections for water, electricity, and sewer but you can tap into existing utilities at the primary houseIn Raleigh you CANNOT split lots fee simple, so setting up completely separate utilities would not allow you to section off the ADU as of nowYour ADU must be on a permanent foundation (no wheels, no ability to move the structure)Construction (labor and materials): $100,000–$150,000Low-grade: $150–$180/sq ft averageMid-grade: $180–$220/sq ft averageHigh-end: $220–$250/sq ft averageLandscaping/Finishing Touches: $5,000Total Estimated Cost: $125,000–$200,000You could easily spend $200k+ with super end high finishes, custom designs, complicated sitework, adding a second story or more sqft, etc.

Water in San Diego is real expensive.  

They focus on safety issues, such as wood rot, water damage, and structural integrity of balconies and decks.

The snake behind the water heater during rehab. 

I also own a water restoration and general maintenance business in the area and the amount of STR owners that we have spoken with is insane.  

Think of all the horror stories about tenants maxing out the heat with their windows open during the winter, deliberately running water bills up, etc. 

New 200 amp circuit panel, Culligan water softner, new washer/dryer, and a deep clean Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?