How would I fill this extra space?

I’ve been working on this build for a bit and the only thing left for me to do is decorate the exterior?


The issue is that I’m quite stumped on how I’d fill this empty space and make it look good. This is what should be filled out:

I’m not entirely sure how trees would work to fill this? Maybe they could, but I’d need multiple tree models. Any advice would be appreciated.

Put up a wire fence and make it look like some natural habitat, etc; put some plains and forest nearby.

I suggest firstly cloning the motel, recolouring it and changing it up a bit, and adding it on the other side of the road to make the road feel more full. You could also add some trash cans near the entrance of the motel, garbage cans. Then, you can elevate some parts of the terrain to make alike hills. You don’t need multiple tree models, you could just use 2 tree models, brush them over the new terrain, and resize some of them to make the forest look more filled.