You might check with whoever it is that regulates the water in the area where you are and find out all the rules and regulations associated with houseboats, and whether or not there's anything that prohibits private owners from renting their houseboats.

99% of banks and HUD prohibit agents from giving codes out to non licensed buyers.

This is helpful since a lot of smaller brokerages can't/won't pay for CoStar access.CoStar has much more in-depth info and search tools.CoStar is a much better product, but can be cost prohibitive.

Before buying a condominium always ensure that the governing documents of the condo association do not restrict or prohibit the rental of condos.

(and a lot of frustration, but also more lessons learned than I can imagine).....I'm currently under contract on 10,000SF building in Portland :)Price per square foot is higher than I wanted, but it's in EG zoning - which here means residential use is not prohibited. 

In both of those condos, they had already reached their rental quota, so no more rentals, and they had a waiting list for in the unlikely event that somebody gave up their rental slot.And some condos prohibit or limit pets. 

To me, that is the real issue here.Personally, I would call the tenant and let them know that I know what they are doing and, assuming I have a subtenant prohibition in my lease, that they are violating the lease.

If the rental property you are referring to is owned by you, the property cannot go into your Solo 401k as this would be a prohibited transaction.

 Transport can be prohibitive, I'm not sure if you would find a mover that will do this long of a move and be aware, when moving homes from one area there can be issues with climate ... ex ( wind zone ratings in hurricane prone areas, snow load for the roof ) .  

In fact, Fannie specifically addressed the confusing statements you referenced above, noting that the “a second home must not be a rental” portion of the lending guidelines was intended to prohibit renting through a third-party exclusively as a full-time vacation rental.