Many of the estate properties are located on lakes or rivers providing unique recreational activities.

This is a unique home and it actually has a full kitchen, 2 bed and 1 bath downstairs and I think it might be well suited as a very large vacation rental(entire home) or both floors being rented separately at some point in time.  

With things like the ONE Linden plan in Linden, which is a 50M plan to improve the neighborhood.

I'd look at that as well as the Zoning Ordinance and Subdivision Ordinance, which every Pa township, borough or city has, or if they don't have those docs, they are covered by the county codes.

You will enjoy the serenity of rural living, complete with a large cleared backyard perfect for homesteading, gardening, or recreation.

The combination of Germany's stable economy, well-regulated property market, relatively low interest rates, and the opportunity for long-term capital appreciation make it a compelling choice for U.S.

I would mention to Tenant B that I was visiting Tenant A and smelled what seemed like marijuana smoke coming from their side and remind them there is no smoking permitted inside the house.

This is the first time I've heard of a city or municipality doing something like this. 

These typically include services like renters insurance, HVAC filter delivery, pest control, and sometimes utility management.

This Wikipedia page gives different wall types and how well they block sound.