We gave her notice and she moved out two weeks later.

(Source:  https://topclassactions.com/la...)Always send a Notice To Quit/Demand Letter before taking any action. 

have given a tenant a 3 day notice and today is the 3rd and final day.

Do you have to provide the previous owner any type of notice for redemption purposes or show notorious possession (neighbors)? 

Finally...your investor-friendly agent should be honest, trustworthy and operate on the highest level of ethics.Note: Please notice that I'm not referencing the word "Realtor" here. 

Get copies of the leases, make sure the owner transfers security deposit with the sale and contact the tenant right after closing giving them notice of non renewal.

I have noticed an increase of people coming from out of state to find a place to live. 

If the tenant is on a M:M you could adjust the terms with proper notice which would include a rent increase. 

I noticed this week that I am looking at properties in almost all of the cities and neighborhoods.

The amount of mediocre AirBnbs that have popped up is definitely something to take notice of and as these properties become more prevalent, the higher end properties will rise to the top of desirable stays.