The driveway slopes down and we should be able to divert the drains from the garage however to anyone’s knowledge is there any solution other than replacing the entire door due to the open crack near the bottom? 

I just thought of a possible half bath solution for the OP. 

(Solution selling.)

I will look into the trust solution. 

There are newer modern electric radiant systems that I have seen but have no personal experience with.

The Code Solution is solid

For a turnkey kind of solution it can be very very costly.We have recently been going through the most aggressive rehab project to date (residential rehab) and I've had to learn about masonry a lot more. 

Believe it or not, Call of Duty isn’t going to help me reach my goals, and I spend most of the time I play the game complaining about how terrible the maps are, how bad the lag is (even though I am just bad at the game of course) and how much I miss Modern Warfare 2.

DO NOT ever take advice from US based companies selling real estate to foreigners, they are not up to speed on the nuances of investing broadly in the US and it's not an one size fits all solution.  

Hi,If you are looking to save money and also a solution to leaking, i would suggest to reinstall roofing with modified bitumen, it will make your space more elegant and attractive, This option is not so long lasting, but is costs less & In terms of durability i would prefer you to go for EPDM method for re-installing roofing.