I suggest what Chris posted. 

I signed a year lease with the tenant already and the management suggested that i extend the lease to a two year.

Then find yourself a wonderful attorney and management company! 

If I sell the house, I would like to use the money for real estate investments and would love to hear everyone's suggestions.  

Of course and I never suggested otherwise.

I suggest you write up a contract with your seller and take it and your GFD to a local title agent. 

However, with the frequent incidents and the persistent odor, even after cleaning, I’m beginning to wonder if this has become the norm for STRs in urban areas.Any advice or tips on how to prevent this would be greatly appreciated!

I would love to hear any advice or suggestions on how to proceed...We just closed on a place in Puerto Vallarta.

I suggest you understand the 50% rule.  

I am just wondering if people do this and don't tell me.