If the tenant is good, I will renegotiate the lease and extend. 

No law says one must wait until April, or extend until October, to file one's taxes.Maybe this time when we do our taxes, we're less aggressive with under-reporting our income and over-reporting our expenses, maybe we're a little more honest about it all with Uncle Sam, so when we hit up his wife, Aunt Fannie Mae, she's nicer to us.

Keeps me from getting financially over extended when at the same time, I have plenty of manpower and readiness to manage the project (and its always around Houston)  

Or extend to 15 years?

He then went on to tell me immediately about all those people that went default about 10 years ago and how I should worry about being over extended.

For example, we have low caps for what we can charge a tenant for not posting payment when due, so a simple workaround is that we actually agree to a higher rent amount and extend a monthly discount for payment in full posted by the 1st.

(caveat to new investors, this extended hold was only affordable because I don't have a mortgage on this property and not recommended.) 

Small maintenance issues like gutters needing cleaned out, dirt around home, extended down spouts leave water sitting by your foundation.

and just to be clear, the boundaries of a federal superfund site are determined by how far the contamination has migrated and is not necessarily limited to the source of the contamination. there can be groundwater plumes that can extend for several miles so that all of the properties sitting above the zone of contamination would be considered to be located within the superfund site but that are not responsible for the contamination but simply impacted. very different calculus than if the parcel you are considering is a source of the contamination  

How should I word the letter to them that I will not be extending their lease and how far in advance do I need to deliver it?