What is the configuration (1bd/1ba, 2/1, 2/2, etc.) and what are the rents.

With the correct configuration, you can make the single family home as well when house hacking.

The bathroom in the basement is poorly configured.

The actual array itself is not physically divided, it can still be one big array in whatever design configuration makes the most sense for the roof space, but a certain number of the panels are allocated to each condo unit and are wired to the appropriate meter/account.

I personally search for leased rentals in the last 180 days that are within 1-2 miles of my subject property and have a similar configuration.

I'm sure there are other short-term rental booking plugins out there, I just picked one that looked full-featured and would provide the functionality that @Nick VanDer Sluis seemed to be looking for.As for some of your other questions, the motopress documentation says it supports paypal and stripe payments (among others), those I have personal experience with and would configure the plugin to use one or both.

In the event that the inspection requires major configuration changes to this furnace, I wanted to get some ideas and suggestions from fellow landlords.   

For many people in NYC, the Air BnB model offers a significant opportunity within the framework of your primary residence - for example, if you live in a 1 bedroom apartment right now, possibly get a 2 bedroom and configure it for guests to stay while insuring your privacy.

Also, what are the monthly rents and unit configurations?

Here is the information.Duplex #1 sits on a residential land with a 2/1 configuration, both units are occupied by long time tenants.