Then use whatever tools you have at your disposal (Skip trace, looking for numbers on LLC docs, looking for their number on MLS if it's an owner/agent, send post cards to their tax mailing address, etc) to get numbers for the managing membersHave a script you can use to call them and ask them if they are buying, what they're buying, price points, rehab level, neighborhoods, etc.The good thing about this strategy, although it's a lot of work, is that you are connecting with actual buyers who have actually recently closed deals

I realize there are many levels to tracking and what is considered income (eg. capital gain, payments that are both principal and interest and is interest really only considered income where the principal is the capital investment).

Without knowing your income level, your tax history, your real estate portfolio, it would be impossible to help you here. 

Do they rise to the level of the tenant being able to withhold rent? 

think we should just jack the rent to the current market levels which would be $300 to 400 higher than what they are currently paying, but I feel terribly guilty doing so since the tenants seem like good people without a ton of money and I don't want to turn their lives upside down. 

In addition to taking action, continue (or start) listening to the BP Podcast or the BP Rookie podcast to keep the excitement levels up.

Each level has 2 bedrooms and 1 bath with new Stainless frig and gas stove down and new white frig and gas stove up.

Each level has 2 bedrooms and 1 bath with new Stainless appliances.

Each level has 2 bedrooms and 1 bath with new Stainless frig and gas stove down and new white frig and gas stove up.

Depending on the level of updates will cost 5-15k.