Buying a bigger house in NJ

Hello,

I am writing this to get some advice and perspective from others. I am married and have 3 kids. My parents live 10 minutes away from me. Due to my father's deteriorating health, I plan on purchasing a house where we can all live together. Hence I have been saving money for downpayment. My budget is max 2M and needs 6 bedrooms.

I have 4 properties now.

1. Property 1 (2 family, I live in one and rent the other)

2. Property 2 (2 family, My parents live one and rent the other)

3. Property 3 (2 family, both units rented)

4. Property 4 (condo, fully paid off)

I have financial benefit of 100% property tax exemption due to my disability status. This helps tremendously in the state of NJ where the property tax is high.

If I were to purchase a new property and move in, then I plan on renting all units. Based on my calculations, I should have net $9500/month from above 4 rental properties income after mortgages. This $9500 is just about the mortgage for 2M house with the current interest rate and 20% down.

20% of 2M is $400k. I was thinking of putting down $200k cash and the other $200k from taking out margin loan from my brokerage account so that I dont have to sell the shares to trigger capital gain taxes. (I have about 1.8M in brokerage account)

At current state, I get about net $2300/month from rental income. So by moving into a bigger house, I will essentially lose this buffer. I would appreciate if you can provide your feedback.

I am not necessarily planning to buy a house now as I just dont see how buying a house makes sense at this time. But just wanted to get some feedback to see if my plan is solid.

HHI: 250k