Look closely at the buds. The female flowers are tiny (about 1/8 inch) red threads coming out the tip. Nuts will follow, but usually there needs to be 2 trees within a reasonable distance for them to fruit. These small trees also make a large clump.

" No tree is going to survive inside like that for long unless it has greenhouse conditions which is highly unlikely. " False!! These are common houseplants and if given the proper care, they can live inside for many years. They don't require a greenhouse! The photos are a bit far away to show enough detail but the first looks to be Ficus benjamina and the second either a Shefflera or Pachira (money tree). They could be silk as well but look a bit too real for that.

If you know where it was purchased, I would take the photo there and see if they know which cultivars of Thuja they sell. A tree that young hasn't developed whatever growth is characteristic, so I cannot help on cultivar suggestions. If you don't know where it was bought, do as Embo suggested.

The many tall tree-like ones I have seen here have all been leaning markedly or have had other things about their appearance/condition that did not make them come across as fully committed, bona fide trees. I like this species much better hard pruned in spring to remain short and bushy. And without the flowers concentrated mostly in the upper sections of long, straight stems that branch comparatively infrequently.