Any other tips or tools that have worked for you when investing and you think I should definitely consider?

this property is zoned for office / medical facility, multi use but has a residential house on it.would love advice from the community on how to1. analyze potential2. source funding3. evaluate market value of property for purchase4. building the development team

It would be helpful to know if you are talking about turn-key properties, or value-add properties.

Most commonly in this area it would be for boats/campers.Specific insurance?

I’m not looking to be the GC (obv) on this and will be hiring a GC.  

They may be able to help offer insight and referrals, should you need more them. 

If you work for a brokerage who doesn't even know how to help you get access, that is a problem, but NYC is not like other areas.

When we do the lease signing, we present each item as we are reading about the corresponding term.

This will determine how you split it 

However, that won't work for several reasons:  1) The lender is not going to finance the $15k assignment fee2) The lender isn't going to consider the purchase price in this example to be $150k, they would typically use the $135k price in the original contract, and 3) In this particular example they may not even use the $135k price because it's not an arms-length transaction since it ultimately boils down to a deal between you and your father.I applaud you for trying to be creative, but ultimately what you're proposing isn't going to work and it's going to make the transaction a lot more complicated than it needs to be.