The property owner must ultimately ensure that the property is safe for visitors.

This uncertainty would ensure very few market participants.

You must take risks, but, ensure that they are calculated risks.Below are some links to get you started. http://www.biggerpockets.com/startherehttp://www.biggerpockets.com/meethttps://www.biggerpockets.com/alertsHow to Use @Mentions on BiggerPocketshttps://www.biggerpockets.com/rules https://www.biggerpockets.com/termshttps://www.biggerpockets.com/inviteshttps://www.biggerpockets.com/perkshttps://www.biggerpockets.com/forums/categorieshttps://www.biggerpockets.com/rei/glossary/https://www.biggerpockets.com/webinarhttps://www.biggerpockets.com/courses/a-beginners-introduction-to-real-estate-investing (video courses)https://www.biggerpockets.com/real-estate-investing (Ultimate beginner's guide to REI)REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REIs)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

@Francisco Feliz yes you can totally do it yourself but I recommend spending a little extra to ensure its all done correctly and you can get support at any time from them.

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I'm the builder, so that's not an issue...the plumbing contractor will be happy to come back, but I want to ensure that I have a reasonable idea of the issue first (since it's not easy to reproduce).A couple things to point, since it sounds like it could impact your analysis above (or maybe not):- It only happens in one sink, which sits between two other fixtures (another sink and a tub). 

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The policy mostly to prevent straw buyers (an investor using your name and credit to buy a property, and his down payment), but also to ensure the investor has skin in the game.

I'd compare/contract all other financial options before committing & ensure you've considered everything in the financials including vacancies.