The general IRS test on determining acquisition date (this I have had to dig into a number of times) - do you have all the benefits and burdens of ownership, regardless of when title is transferred. 

Managing a same-day transaction required meticulous planning and coordination.

I originally created an llc to purchase the land, however decided after to buy it in my name and transfer into the llc after the house is built, rented, and refinanced.

Managing a same-day transaction required meticulous planning and coordination.

The loan officer says the refinanced amount would be 75% of the purchase price and not the new appraised value after rehab.In this case, is it a bad idea to transfer ownership of the duplex into my family member's name and then purchase the duplex back but this time financed? 

Managing a same-day transaction required meticulous planning and coordination.

Why would I have them hold my money when I can have full control over it if they transfer it over to my accounts in 1-3 business days. 

If you are setting aside funds for capex, taxes, insurance, or other expenses that don't occur monthly, transfer those funds to Savings each month and hold them there until it's time to spend them.

It's NOT an interesting point, once sold and transferred that's it, it's yours.

In RB for example, actively licensed properties have a window where the permit can transfer to the new owner.