Can you 1031 a duplex (long term rental currently) or multiple duplexes to invest in a beach front property and use it as a short term rental?

I have 19 long term rentals and do some wholesaling/flips as well.

As might be the case in a Flip that needs work or similar.I am assuming that it would be OK for me to do normal maintenance on a rental that I would be holding long term - such as mowing, small fix-it projects, etc..

I saw some interesting single family houses (newly constructed) in the range of 200-300K, for examle in:McAllenEdinburgSan JuanMercedesHow can I deep go into research about those cities and neibarhoods in term of demand for rentals and for sales?

It will take a long time to recoup the cost on a property this size. 

Long-term hold rental Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I plan on extending my wings far and wide in terms of location.

He gives a discount on his hourly rate for rental property owners in hopes of making a long term relationship.

But, Facebook has been limiting my listings, and many emails get stuck in spam folders.What are your most effective methods for finding buyers?

Are you looking to hold on for long term appreciation while getting some cash flow or are you looking into other potential investment ideas?