A. In Episode 5 of Season One of Resurrection.

These are actually two separate scenes, which, at first glance, appear to be together.

In the first scene, we see Dexter & Mia (“Lady Vengeance”) walking together down a street in Manhattan, following their date at the wine bar (where she reveals to Dexter that she kills just for the thrill of it). She is wearing a unique gray fur coat. 
 

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They walk under (what, to non-New Yorkers, appears to be) a rather unusual structure of arched poles forming a sort of walkway.


Believing he is the Dark Passenger killer, she wants to see him kill someone, and starts to hail a rideshare car, thinking they will kill the driver. Dexter prevents this, which angers Mia, and she storms off in a huff, claiming Dexter is a tease, and it has left her “murder horny”.

 

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In the second scene, we see Mia wearing a similar stylish outfit and walking under what appears to be the same arched walkway.

Only this time, she is alone, having dumped Dexter to go hunting for victims on her own.

 
She walks down the street, and stops to check her makeup in a reflective surface before entering a cocktail lounge, where she picks up some unlucky fellow and takes him back to her apartment where she plans to torture and kill him.

Q. What is it actually in real life?

A. Two different streets in Manhattan. 

Q. Where can I find it in real life?

A. These two scenes have so many things in common they appear to have been shot on the same street.  In the second scene, Mia is wearing a similar outfit, and is walking under what appears to be the same arched walkway.  
 
But in reality, it isn't even the same street. Despite the similarities, the two scenes were actually shot over two miles apart.

Those  arched walkways are known in New York as “sidewalk sheds” (or occasionally “scaffolding bridges”), and they are just covered walkways designed to protect pedestrians below from falling objects during construction on the building they are walking past. The current versions, with their curved lines and arches (that have been compared to blossoming flowers), are more fanciful and aesthetically pleasing then the older versions with their simple straight posts. But the new sheds look virtually identical, and they are ubiquitous in NYC . Everywhere you look in Manhattan, it seems, there is a sidewalk shed; sometimes multiple sheds on a single block. I'm told there are over 6,000 such canopies in NYC.  Which makes it easy to confuse one of these temporary structures for another. 

And such is the case here. What one might think is the same arched walkway are actually two different sheds, on two different streets, located miles apart. 

The first walking scene was shot on Lafayette Street, down in Greenwich Village. To be more specific, it was shot on the 400 block of Lafayette Street , between E 4th Street and Astor Place.    In the scene, Dexter and Mia are walking south down the east side of Lafayette Street. While walking, they pass The Public Theater, which is at 425 Lafayette. When they stop to argue and break up, they are standing in front of Barry's, at 419 Lafayette.  And the first sidewalk shed, seen right behind them in one shot, is at 417 Lafayette. Here is a matching StreetView of the street where Dexter  & Mia were walking:  Here is an aerial photo of the location.  And here is a map link.

 

The second walking scene was shot on W 45th Street, which is in Midtown Manhattan, over two miles to the north of Lafayette Street.    In the scene where we see Mia walking alone under the “sidewalk shed”, she is walking west down the north side of W 45th Street.    She then enters the cocktail lounge where she picks up her victim. As she is walking through the sidewalk shed, you can see an awning behind her reading .“Manhattan”. That is Cafe Manhattan, at 35 W 45th St.    This particular sidewalk shed must be a relatively recent addition, because it doesn't show up on any of the StreetViews, although it certainly is there in that Dexter scene. It appears to stretch from roughly 25 W 45th St (on the east) down to around 49 W 45th St (on the west). Here is a matching StreetView of the street where Mia walked alone:    Here is an aerial photo of the location.  And here is a map link.