.I took the average $4,000,000 house in Pacific Palisades CA and it shows a monthly tax payment of $4,167 for a total of $50,004 a year.

What type of transaction fees should I be looking to pay and is there a down payment required?

Personally, I wouldn't use a heloc to then go purchase a primary residence, unless what you can rent the current SFH for enough to cover the current mortgage (assuming there is one on the property) and the heloc payments.

You can also add co-hosts to listings as well, which allows two accounts to access each listing, but not in the same ownership rights (for example co-hosts don't have access to payments). 

@Charles EvansFrom my experience, having rental income of $1,400 to offset a $2,600 mortgage, leaving you with a $1,200 payment, is a manageable setup with an income-to-mortgage ratio of 28.5%.

It depends on what the terms of your mortgage are.Pros-with no mortgage, you have higher cash flow.Cons-if you plan on buying more properties, you are better off saving the money for a down payment for your next place.The big questions are: can you get higher than 7% return if you invest that money elsewhere? 

He wanted 1/3 payment up front in cash and I paid him.

The down payment is 25% down for single family residences and 30% down for 2-4 units.

I could put a down payment for a conventional (20-25%) 550k duplex, but I feel it could hurt my chances of buying as many duplexes in a 5 year period (for example) if I go conventional VS an FHA at 3.5%. 

Option 1 - NOI = Rent - (maintenance, vacancy, management, property tax, insurance)or Option 2NOI = Rent - (property tax, insurance)in both cases i assume DSCR = monthly payment/NOI