Adding area rugs is a good start to dampen the noise, but you might also want to consider asking the upstairs tenants to be mindful of their noise levels, especially during certain hours. 

A large family would never want to share a private house.

I developed a 3 story suburban walk up product though because that is what most large development firms design and the highest profit type of construction and most stable right now.

Unless your properties are free and clear or mortgaged so low that the rents will recoup your building costs in 12-24 months by adding more sqft...

Adding more units could boost your income too.

The cost for the assumption of $900 and the 2 1/2% would just be added to the loan assumption amount and that would be the total basis.  

Chesco is constantly looking to add new properties to offset the surplus; we added 5+ units within the last month. 

You just have the added costs of an LLC. 

I've mentioned on here ad nauseum.

Any insightAll you're really doing is adding living space, just like a garage conversion or garage apartment.Fundamentally this is prepositioning project, and is a solid strategy.