best way to denote the infobox of a map marker as clickable

I have a set of markers on a map. when the user click on the marker, an Infobox opens up.

When the user clicks the Infobox, the app will open a streetview for that marker. However it is not intuitive that the Infobox is clickable (see image below).

What is a good UX to let user know that this infobox is clickable?