@Will Fraser @Son Tran, like everywhere else in Oklahoma City proper, conditions and values vary vastly from block to block. The "high" prices in what may appear to be challenged areas reflect a multitude of variables.
For example: To the west of Pennsylvania, between 25th and 30th, is the Shepherd Historic District. It is on the National Register of Historic places and the prices there have been through the roof for at least 5 years. it is comprised of wonderful brick Revised-Tudor homes with whimsical architecture and is a truly lovely place.
Literally the next block on the east side of Penn is a class D war zone with drive by shootings and the whole works. Immediately upon crossing 23rd to the south or 30th to the north, conditions deteriorate, sometimes rapidly, however, intermittently to the south, one finds blocks of grand old homes restored to their former glory. To the west, between Villa and May, Cleveland and Venice neighborhoods are jewels.
As times and preferences change and people return to the urban core, these older homes become of more interest both because of location and because of architecture and build quality. 15 years ago, Shepherd, referenced above, was no better than class C and portions of it were war zones as well. All of this is to say, broad categorizations don't work in Oklahoma City (and probably not anywhere else) it's one of the reasons out of state investors can be ill-served, there is too much variation. All one can do is drive those blocks, look at those properties, talk to the neighbors and do one's level best to calculate where change is coming from next.