The lower unit had some extra features, so there was an increase in rent. 

Generally NO if they a) have extensive rot or b) were poorly/lightly built in the first place. 2) Is the home worth saving due to location, size, architectural features, etc? 

I am getting better at trying to tag individuals in replying to posts, but is it difficult to include the tagging feature when editing or updating a post?

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alertsThere are a few self-contained guides that you can access here: https://www.biggerpockets.com/guides

Chasing extra features is a race to the bottom.

As Account Closed said, add features like additional beds or baths. 

It has all features I need. 

I like the search features: https://www.biggerpockets.com/search

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alerts

@Chi Ta I started with nothing, I went to a seminar and the guy said if you don't have any money get a bunch of credit cards and buy a house, so that's what I did.