Here's a tricky point to remember:
Not all land are equal.
Those that allow you to build 4 land footprint landmarks are probably worth more in your final location.
To be fair, they are relatively common, but to find one that is far enough from the border is also a consideration to bear in mind.
As you can see, you cannot build a 4 footprint Landmark on the first picture shown, but you can on the second.