I recently added a half bath were half bathrooms add $50k of value

If someone is coming to Danbury for STR, I don't think they are going to want to share bathrooms and kitchen.

Also consider adding higher end finishes in the bathroom(s).

You can get some estimates from contractors for what they charge for big ticket items like to renovate a bathroom, renovate a kitchen, replace the furnace, replace the roof, etc.All wholesale deals should have free and clear title and you should be able to see the sales agreement before submitting the earnest money deposit.

While there are some limits here (you don't need a pasta maker), asking about having a plunger in each bathroom closet is insane.

Meaning you may be able to do some cosmetic or smaller renovations like bathrooms or kitchens in your duplex when the tenants turn over and those smaller investments can demand higher rents, so in the longterm you may have more cashflow from the duplex to help fund a future investment in another property while you wait for market conditions to change.

Finished basement as well with additional room (and has the additional bathroom). 

We walked the apartment and found some gaps behind the bath vanity (that may have bringing dampness from crawlspace). 

Consider looking for a large single-family home with the ability to add more rooms or bathrooms, then rent it out by the room. 

Every time they smoked in their bathroom, they would turn on the vent to get the smoke out which in turn made my whole apartment smell like a ganja lab.