Q.Looking for the appropriate tree.
I need a narrow tall growing tree like a tiny tower cypress for the front of Spanish house that faces North and gets little sun, what would best grow there? The tree must be narrow so we don’t block the views
You are in zone 10b.
Leland Cypress may be your best choice.
I would suggest visiting some local garden centers; they would be stocking the best specimens for your region and often have test gardens where you can see mature plantings.