Park Row stays fully accessible throughout the game. Because of the easy street structure and lack of flooded areas, it's also easily to navigate. However you will need to look out for armed enemies placed on the roofs of some buildings.
There are two big buildings in Park Row which you can examine, both containing a few Trophies and Riddles. The first one is a Church and a Medical Center in one (screen above). It's worth to notice that if you want to examine this building after completing Locate the source of the sniper shot, you will have to use the Electrical Charge to gain access to the main part of the Church.
The second building in Park Row is the Solomon Wayne Courthouse. During the beginning part of the game, accessing the building won't be limited in any way. However after Scan the TYGER helicopter to locate the Master Control Program the main entrance will be unfortunately destroyed (screen above) and therefore you will have to use the entrance at the back of the building.
Batman Trophies - 36
Riddles - 14
TYGER cameras - 12 (4 challenges) + 1 camera Relay HUB
Catwoman Trophies - 5