There is a condo complex next to Kauai Shores (just to the south) that faces Lea Nani Beach. It’s not the Kapaa Sands. It’s between the Kapaa Sands and Kauai Shores. The buildings are a light brown/tan, and I think all of them face the beach. I tried looking it up on Google Maps and I can’t see a name. They looked nice—a possible contender for next time.
Good question. Based on your description (condo complex just south of Kauai Shores, light brown/tan buildings, facing Lāʻē Nani / Lāʻī Nani Beach), the condo complex you saw is almost certainly Lae Nani (sometimes spelled Lāʻē Nani).
Here’s how I reached that conclusion along with some details:
So, while you couldn’t find the name on Google Maps, your memory about the color, location, and beach alignment aligns very closely with Lae Nani.