1031 Help! 3 Rental Property exchange for specific raw land

[Angela P.]

Hi Everyone - here's the facts, can someone help me understand if I am going to run into any issues or if this will work and I should pursue? 

I have three rental properties I am interested in selling and buying raw undeveloped land (for investment for at least a few years - and then I will either sell it, or I will build on it and use as my future primary residence). 

Property 1 - $305k value, $146k debt = $159k equity (**note, this was once my own personal residence, has been a rental for 7 years-does this matter??)

Property 2 - $307k value, $155k debt = $152k equity - held for 5 years

Property 3 - $298k value, $136k debt = $162k equity - held for 3 years

Purchase property - undeveloped land - for sale for $475k 

Questions:

Is it as easy as selling the rentals, sending the cash to the intermediary, identifying that I want to buy the land, having the intermediary buy the land with the cash? 

If I hold the land for a few years (how many?) and then decide I want to make it my personal home - do I indefinitely defer the gains on the rental properties?

Thank you in advance for your guidance!

Angela