How do I pick by Y value?

I'm using a hex tile map where the tiles have a height value so I can't just use the tilemap object vanilla style so each row has its own tilemap instance. Well, to operate on this tilemap I'm going to need to need to figure out Y coords by picking specific tilemap objects.

For example, to make the map bigger, I want to create a row on top of the highest one, but I need the y coords of the highest (lowest y value) instance. How do I pick this instance?

You can try to use the "pick lowest" condition and use a instance variable with the object Y value in it

Or the hacky way, "For each ordered" with Object.Y ascending as order expression, with an exit loop as soon as the first iteration finishes.

"pick lowest" only lets me pick instance variables, it won't let me pick by instance properties.

Edit: Ooops, I goofed on object creation. But the "pick by ordered" then exit loop works.