How to find land to build multi family unit?

[Alex Klimenko]

In our area it is impossible to find mulit family units for sale. Only thing close to that is townhouses/condos and they sell as individual single family units, not a whole section. One of the best options would be to simply build a 4-5 family unit, or 2 duplexes, or a 4 townhomes etc. 

However, there is a lot of land restriction. Great properties that dont allow out. How does one go about finding land that will in fact allow multifamily building?