I dropped by Maplewood Park early yesterday evening and took a look at the nest, but I couldn't make out any adults in the nest from where I was - there are a couple of spots where you can get a decent look, but only from one side. With my local nest it's often really hard to see any adult from the ground when they're flat down. I also dropped by briefly last week and also couldn't see any adults visible on nest from ground level - but I did hear adult calls from the trees further down. I was unable to find either adult and they seemed to keep shifting position from the calls, but I'm pretty sure I heard two separate adults.
So I'm not sure of the status of the nest - they ought to have hatched eggs or be very close by now if the nest is still active.