The property mirrored the value of duplexes through the years.

I don't think it makes sense to look in the rearview mirror unless you're trying to learn from your mistakes.

But what everyone is over looking, is that rarely does a specific market, a specific neighborhood mirror what housing does on a national scale. 

I suggest you look urself in the mirror and ask what the point of a comment like urs was?

If they didn't do that, they would starve when winter arrives.The Future is VERY important.Another analogy I like to use is to Drive your Investments like an Investment Vehicle.When you look at past Data such as previous Sales, you are looking at the Rear View Mirror of your Investment Vehicle.When you look at current data, such as the current Rents and Expenses to calculate your Current cashflows or your Cash on Cash Return, you are looking at the side view... watching the action go by as it is occurring.When you look through the Windshield of your Investment Vehicle, you are looking at the road ahead.... seeing the path that it is taking you... and all the obstacles in the way.You are less likely to CRASH your investment vehicle by focusing on looking through your Windshield than remaining fixated on the Rear View Mirror or the Side Windows.If the bridge is out and you fail to see the bright red warning signs..... if your eyes are not looking straight through that windshield........ you will Drive your Investment Vehicle into the abyss down below.So please.....

I have or am investing in all of these strategies, so the other possibility to think about is you can combine strategies.Keep in mind that we apparently have entered a period of rising interest rates, and that 4% rate will likely look really low in a rear view mirror not far down the road.Whatever you decide to do, you are in an excellent position.  

Curious about the mirror, specifically removal of the old one.

Class B - No carpet, luxury vinyl plank, stainless appliances, paint agreeable gray w/ white ceilings, if current countertops are in bad shape, I replace with quartz, if cabinets are rough, I paint white, if bathroom mirrors have no frame, I miter cut door trim and attached with calk, ceiling fans in all BRs, W/D hookups, add deck if possible & cost effective, if flower beds around house, cover with pine needles, last contractor in is professional cleaner. 

My point is stop with the smoking mirrors.

She is in your rearview mirror gaining more distance every moment, AND she has alerted her friends not to rent from you!!