No, you won't find 1 Main Street in Costa Rica and probably won't find any street names or signs. If some place is referred to by a street number, it probably won't help if you ask anyone for help.All addresses (directions) in Costa Rica are based on landmarks and meters. 150 meters west of the Church 25 meters north. That would translate to 1-1/2 blocks west of the Church and 1/2 block north. Don't don't expect half blocks 50 meters to be used commonly and even more rare is the 1/4 block, 25 meters.
Don't get your meter stick out and start counting either. 100 meters = 1 block, whether its length is 50 ft or 5000 feet.
Good luck when the direction is 5 km north of something. That might mean 5km or it might just mean "a long way". Also good luck with the landmarks as they may or may not still exist.
Asking for directions isn't always useful either. Once I had an ultrasound test at a lab. Once I got to within 1 block of where I though the lab was I asked for directions and got sent someplace far far away (I took I taxi).
There it was, the lab I was looking for. Inside they were confused because I was sure I had an appointment and they were sure I didn't. They did the test anyway.
When I saw my doctor I learned the lab I was looking for was right where I was when I asked for directions. The nice lady that gave me directions sent me to a completely different lab with the same name!
As a tourist it can be really fun using these addresses and the adventure of searching place. When you live there it gets old fast!
When someone starts telling you that Costa Rica is moving away from being a 3rd world country, ask them for an address.