What is the value of own adjoining units or nearby units?

[Robert Calabro]

Are there any intrinsic values or benefits of purchasing an adjoining condo unit to a rental I already own? 

Buying the second unit would make me a 100% owner of a duplex that has been converted into 2 condos, so I would essentially become the only member of the "HOA" for this small 2 unit condo "complex", which doesn't really regulate anything as it is.

The subject property will cash flow, but not quite as well as the property I already own next door. Are there possible other reasons to still pursue this property? 

TIA