Upset Sale on Land Behind House - To Buy or Not?

[Peter U.]

Hi All, 

Currently, my primary residence is a 1250 sq ft 3 bed 2 bath house on about .25 acre. A few weeks ago, tax upset sale notices were posted on a few parcels of land behind my house. The land totals around 3 acres, with one of the parcels being directly behind my house. The approximate "upset" price posted was extremely cheap, so I was considering buying the parcel behind my house at auction next week. If I did that, my total would be around 1/2 acre. 

Looking ahead a few months to a year, my family and I plan on moving out of the house and keeping it as a rental. Our mortgage is less than half of the property's value and rents in the area are decent. 

My question is this: Does it make sense from an investment standpoint to buy the quarter acre behind my house? I know it will make no difference to renters, but in the event that we would decide to sell the property eventually, I am curious if it would increase the value. Additionally, would there be any value in buying all of it if it is cheap enough? (this part depends on what I would do with it, I know..)

Another note.... I don't think there will be too much competition for the land because it is landlocked. Apparently, the current owner wanted to develop it but the township would not allow them to create an access the property via the small "lane" between my property and my neighbor's property. 

I appreciate any thoughts on this!