What a great story.
I, for one, am not selling in this market. I wouldn't discourage you from selling, but I think there are a few questions that have to have some solid answers to first.
The pros to selling is high valuations, and low capital gains tax rates. The cons to selling is potential for inflation, and (again) high valuations in other asset categories.
My question is, what would you do with the capital? You are probably looking at a capital gains tax of at least $26k, maybe more, depending on your state and other income, and the cost basis because of deprecation. Your closing costs will be something as well, maybe as much as $20k. If you are just going to park the money in a different investment and hope for historical returns I am less inclined to support that. If however, you can 1031 exchange into another multifamily property whereby delay your tax liability and increase your monthly income it may be a great option.