Should I 1031 for a multi-unit?

[Mary Gold]

I own a rental condo with over 50% equity right now. 

If I sell it and do a 1031: 

1-Would I be able to get a multi-unit (4 units) if I can get about 30% downpayment? 

2-Would I still be able to occupy one of the units, even though it's a 1031? 

3-What if I don't occupy a unit?

Thanks.