A lot of people are confused about how the parking lot works so I will explain it in this short guide.
There are 2 ways to expand your lot.
The first is to do the lot expansion which costs money.
The second is you have to buy spaces for your lot so you can place more vehicles in the lot. Just like for restorations you have a limit on how many vehicles you can put in your lot regardless of the space you have.
You can gain 2 spaces for cash and then you have to buy any additional spaces with candy.
These spaces are pretty expensive candy wise so think hard before you buy them.
One thing that not to many people know is that you can place vehicles in your back room.
Your back room can hold as many vehicles as you have room for.
This will help free up your inventory space for other items.
Hope this helped clear things up for you.