At least they are broad leaved evergreens and not conifers. Conifers are often used for such purposes but they are a really bad choice.

Hedges like holly (BLEs) can be aggressively cut back and expected to resprout, conifers will not.

Seeing the presence of Agave, it looks like at least a zone 8A climate, maybe 9. And going by the gravel, it looks like arid. So maybe anywhere from south Texas, through Arizona, New Mexico to Nevada and California? However considering that there are probably hundreds and hundreds of options for broad-leaf evergreens in those climates...it could be anything.

My guess is whatever they planted look like they will soon get large quickly, given enough moisture, and will need shearing on a regular basis. Something that would resemble that might be Ligustrum, Cherry laurel, a type of Holly, Osmanthus, Ficus, Laurel, Wax myrtle, Eugenia, etc. etc.

It would help if you told us your location and folks can recommend something that's actually appropriate to your growing conditions.

Sorry my bad. I didn’t provide my location. I’m in Northern California, SF Bay Area.

I got this photo from Houzz app. I liked the tree on the fence and I wanted similar setup for our house. I recently did a concrete work on my backyard and there is a planter area around the border / fence.

It's not really the tree you like per se, it is the shape and form. You have provided a general location which is helpful. However I am of the impression that the Nor Cal Bay area is going to have multiple micro-climates. The actual specific site conditions of your fence and your house and your location's climate zone can help dial in a suitable plant with that shape and form and how much hedge trimming your future will hold.

Hedges like holly (BLEs) can be aggressively cut back and expected to resprout, conifers will not.

Except yew for instance. Which can even be cut to near the ground and will regrow, is a frequently used hedge plant.

Thanks all. I finally got hold of the source of the photo which was a landscape designer and they gave me the name - “Ficus nitida”.
After some googling, I found that this is not something we would need.

I want some light set of trees by the fence to give me a columnar style. Will keep looking. Pls suggest if you know of any.

7 to 8 feet is not a tree. It is a shrub. I'll just throw Sky Pencil Holly at you for to go have a look and hope it is a good high sun location by your fence in your yard some where in the bay area.

Thanks @Christopher. I also stubbles upon the same kind while googling. However, do they not grow like 12ft or so ?

This is what it looks like now. I just finished the concrete on Saturday. This is what I see from my living room french door. So instead of the ugly fence, I want some nice tall bushes or plants.

There's a skinny podocarpus I've seen used in the area for a similar effect. I don't know the name of it though.

How much space between the fence and concrete? You may be better off with large containers to hold large shrubs. No experience in your climate, just saying.

Very few columnar plants will grow to 8' and automatically stop growing. The solution to that is called pruning -) Sky Pencil holly grows slowly enough that keeping on top of its height will not be a problem.

You might try an espalier if you are willing to put in the time to pruning and shaping. Perhaps three or four Camellia sasanquas would work for that space. They don't grow incredibly fast and I think you could keep up with them. But keep in mind, once you install, painting or staining the fence will be extremely difficult. Maybe train them on a trellis 6 to 8 inches from the fence so if you need to stain, you can bend them away?