Lurker/1st time poster here! 

My husband and I own 3 homes: 2 rental duplexes and 1 single home in which we live in. We are looking to relocate to central Florida this year and want to sell one of the rental duplexes. Upon doing research and speaking with "experts", we are getting different info. We don't know if we should go the SF route or the MF route. We'd love to duplicate our current situation where one unit pays the mortgage and the second unit is ours free and clear. It seems that MF in Fl are not that common and the ones we've see are not in the greatest shape. We want this process to go as smoothly as possible however matters are complicated by the fact that we're not there. My husband will be visiting next month for a weekend to view properties so my questions are: 

Considering it's Fl, should we look at MF or SF? And/or multiple SF? Which is what has been recommended. 

How long can the list of properties be within the 45 days? Can the list be amended within the 45 days? 

We just got the pre-qual letter, is there any other documentation we should obtain? What would the next step be? 

Sorry for my ignorance, we're really new at this and are trying to do this in the most efficient and cost saving way possible. Thanks!