Does this value-add opportunity increase the value of my property?

[Jin Lee]

I've spent the last 3 years nagging the city to sell me a lot next to my property so I can install a driveway and they've finally agreed. This extra road frontage now also qualifies my property to be able to be legally converted into a triplex from a duplex. The property has a massive 900+ sq ft attic with very tall ceilings that would make a perfect 3rd unit potentially grossing another $1000 per month. 

Without actually building the 3rd unit, would this new triplex eligibility increase my property's value?