Here's a photo of the coverage map that I created using Sonic's online coverage tool. As you can see, 39th Avenue has coverage going South as far as the 2400 block until you reach Ulloa St., which is the unlabeled street one block North of Vicente St. Then the coverage stops abruptly. The first red shaded area is the 2500 block. The block we're moving to is the 2600 block.
Meanwhile, 38th and 40th also have coverage in this area. However, instead of the coverage stopping at Ulloa, it keeps going South indefinitely, down to and past the 2600 block.
Is it possible that Sonic's records could have a mistake in them? Is there any way for a technician to check the lines in the area to make sure they aren't Gigabit fiber ready?