<｜begin▁of▁sentence｜>### Instruction:
As a property appraiser, you have been tasked with updating the bounding box Y-coordinate of a 2D grid graph representing a real estate property to 15, while keeping the same X-coordinate, width, and height. You need to use PyGraphviz to visually represent the property’s layout and make the necessary adjustment to its Y-coordinate. This is essential for accurately determining the property's value for sale, purchase, or taxation purposes.
### Response:
from networkx.drawing.nx_agraph import view_pygraphviz
from networkx import grid_2d_graph

# Create a 2D grid graph
G = grid_2d_graph(4, 4)

# Use PyGraphviz to draw the graph specifying a bounding box
A = view_pygraphviz(G, prog='dot', args='-Gbbox=5,5,30,30')

# Access the PyGraphviz AGraph object
agraph = A._get_agraph()

# Get the bounding box (a BoundingBox object)
bbox = agraph.get_bb()

# Set the midy value to move the center
bbox.midy = 15

# Apply the new bounding box to the AGraph object
agraph.set_bb(bbox)

# Draw the updated graph
A.draw()
<|EOT|>
