Quarterly would even be better for low end  This is a great time to make sure A/C filters are changed, drain lines are cleared, waterlines are tight, (asset protection) and to get a peek at how much self-respect the tenant has....If they don't respect self, they won't respect you.  

Make sure they don't go crazy with filters etc.Also, not doing arbitrage...there is no real growth with arbitrage.

Do you recommend I filter houses by a certain year? 

Here are some similar tips to what I shared with her:1) Search "DFW" or "Dallas" and filter by "members" in the search bar.

We're confident the coating will last a few years but I'm not holding my breath.

If you begin filtering and structuring your search for a specific type of goal - it will greatly assist you on saving time and energy since there are so many avenues to go down in real estate.

It was hard to breath in there.

This will definitely give you some breathing room on that cashflow in the meantime.

I needed a breath.

@Tommy Cheng Hi Tommy - a couple that come to mind are loopnet.com (filter on land) and landflip.com.