Getting a very low bid sounds great until issues inevitably arise.

It must also be printed or typed and posted by the landlord in some clearly visible place on the premises.(237)The disclosure is important because the tenant must be able to contact the landlord or agent when repairs are needed or other problems arise.

An appraiser generally works only from comps - which can be tricky in a rising market because even if the house three doors down sold for $1m two months ago, yours may now be worth $1.2 on the open market - but with no comps to justify it, the appraiser can't say that.

Are you concerned with any issues that might arise from this?

Check on set backs, zoning ext, I have found while having dialog with the counter person usually one or two questions will arise that I had not thought of yet.I don't know about Arizona but in Oregon if it is your primary residence you can do all the work on your house with out a license.

If you don't address problems when they arise, it will get worse.

SFR is easier to sell if the need arises and may offer more market appreciation.

Other than the good advise that others have already provided, I would add that you need to be ready for the opportunities that do arise. 

THere are a lot of other issues that can arise from this product that make it like the payday loan industry.

However, there are additional legal concerns related to the status of the swing set and how much of a fixture it is, and what kinds of tax/payout requirements will arise.