Tips on creating a separate unit with basement

[Clarynda Young]

Hello, 

I have purchased a house in Dallas Texas that has a finished basement ,one bed one bath with a separate entrance in the back of the house. The top half is a two bed one bath front entrance for access. I would like as much privacy between the two units but I need ideas as far as closing off the first floor from the basement, having access to the w/d when the hookups are downstairs for the tenants above, and backyard privacy for each tenant. I greatly appreciate any ideas as far as how to make my tenants not feel like they have to run into each other all of the time and provide privacy for the basement tenants.

Claire