I have a SSN when I was in the USA, now I am an Expat and pay my taxes in the UK (double taxation agreement).

then, if your daughter maintains ownership for the next two years, profit on the sale (up to $250K) should be excluded from capital gains taxation (provided Trump's tax reform does not eliminate the capital gains exclusion on the sale of a primary residence).Because your gift of the property to your daughter exceeds the annual gift tax exemption, you will have to file a Gift Tax return along with your annual 1040.  

In addition, converting to a C corp causes double taxation and becomes very expensive if you have alot of properties.

AND he is also really knowledgeable/experienced with REI taxation and returns.

Each state has their own taxation and guidelines for rental properties.

If it's doable will there by any consequences in terms of taxation for us, the LLC owners?

As far as taxation, if he is overseas and he is the one actually deriving income from the US and not paying taxes in connection with the foreign income, BIG problem.

Other than that there is no difference or distinction in taxation when shifting types of real estate.  

(All right you do pay some tax but not all the tax at least)

Owning real estate in a C-corp is not the best idea due to double taxation.