$40,000/door in apartments buys infinitely better location and attracts infinitely better qualified tenants than $40,000 SFR.  

This is like a baseball game where you get an infinite number of pitches.  

Find a good expert in residential construction and your homes will fly off the shelf because they were done right.

Some stuff I did to get inside and show you care;The grand welcomes,Ceiling fanNew garbage disposalStrip light under cabinetNew light fixture(s)Under sink storage rack screwed in typeUpper shelf in closet or utility areaOther vistsSanded drawer guideCheck cabinet latches and tightenClothes rod holders screwed inTub enclosure adjustments serviceTouch up paintUse wood tone or white marking pen on woodworkTighten door knobsAdd window latches, wax guides3 in 1 on door hingesFix any dripping faucet, shower head-replace the disk in the headSome things I can remember, but there's tons of stuff you can do.Takes less than ten minutes and keeps stuff running smooth.Best of all, it's one on one time and not about the "business" side, always asking where rent is or reminding them to return the trash cart, it's positive LL time, show you care about how well they live in your unit.

If you invest $0 your ROI is infinite.

In general from talking to realtors and other investors, everything is flying off the shelf.

Some things have just gone past a shelf life and need to go to the dump.

There are virtually an infinite number of notes that either exist, that can be created, or that can be modified.

What I do, is put the cards in a drawer or desk or hidden on a shelf or where ever.

You don't want to be locked into a tenant for more than 1 year at a time.2 - Option:  This is a contract that gives the buyer (tenant) the right to buy the property at an agreed upon price over a period of time...the agreement has a "shelf life"...usually 1 year, but again don't give a 5 year option.