Trees in commercial bldgs do just fine with artificial light I am just not sure how you would do that in this situation so you would need to address that. What kind of tree are you thinking , some are better than others in low light.

I was thinking of placing bamboo trees but they don’t do well at all in low light. I’m completely lost about what to do.

Ficus.....

" It’s important to note that the ground floor is above the second floor as my house is on a steep mountain " Huh?

So how tall do you need this tree to be? How wide?

Maybe something like an understory jungle plant like Draceana fragrans , or Schefflera actinophylla.

Very confusing description. To most of us, the ground floor is the lowest floor (unless there is a basement), so it would not be possible for it to be above the second floor. I don't think anyone has any idea what you mean. Instead of plan view, you should be showing us a "cross-section" view. Bamboos are not trees.

Is there direct, overhead light for the tree's planting bed ... or must light go around a corner to reach it? Do you have any views of the situation other than plan view?

I live in Amman, Jordan

decided to cruise the web for you ...

found this: https://duckduckgo.com/?t=ffsb&q=indoor+tree+in+staircase&ia=images&iax=images&iai=http%3A%2F%2Ffeelitcool.com%2Fwp-content%2Fuploads%2F2017%2F01%2Fundertsiars-plants-that-you-will-have-to-see6.jpg

one of the links there is: http://feelitcool.com/17-under-stairs-plants-for-a-natural-experience/

just looking at the pix.. it seems many have windows for light ...

your base problem will be that you have no natural light.. so you will need proper supplemental light to grow plants ... unless you treat them as disposable over time

ken

It would help to clarify the questions that have been asked.

Looking at pictures in the link provided by Ken, where plants are growing up under the stairs, and especially into the stairs above, I find that wholly unappealing and can't imagine why anyone would want it. In the example cases, there is plenty of light so a better prognosis for the plants. In a darkened situation, I can't see that it would be attractive. In most cases, under the stairs, if not left entirely open for view, is where many people build in storage, which can look as nice as any cabinetry can look. It seems like a much more practical solution.

I’m thinking of adding a skylight above the stairs on the roof to fix the light issue. What do you guys think?

Skylight would help a LOT, the larger, the better!

I’ve discussed the matter with my architects, and the skylight will be far too expensive to install. However, they recommended we add a y’all, modern chandelier and put some small plants or a small sitting area at the bottom. What do you guys think?

you will need to provide the light ... which means you will need electric at that location ...

if the plants are small enough.. and you have other places with light for plants.. you could cycle them once a month or so ....

understand that a chandelier is NOT a plant light .... it will provide no light useful to the plants ....

i figure.. as long as you have electric .... your future is all set ... may as well build it in now .. whether you end up using it or not ...

i think there is a forum for indoor plant lights ... perhaps someone else can link you ...

ken

ps: here is a quick link.. note how close the lights must be.. for the requisite intensity ... which will be another base problem ...: https://duckduckgo.com/?t=ffcm&q=indoor+plant+lights&ia=images&iax=images

As someone who grew up gardening (I made my first garden when I was in elementary school) and who is the daughter of a florist it just about killed me to swap out my indoor palms for artificial ones, but I did. I got tired of dragging them outside to water them, they didn't particularly like the dry air in summer here, the dogs liked to root around in the dirt, etc etc. The new artificial plants are very nice; the fishtail palm looks real until you get within about 2' of it. You might just take the easy way out...