Might be tougher to blame them for watching this if it got stopped up with leaves that were not their fault.Now if they stuffed a rag in the drain (in the lease or not) I would think they would be negligent and be responsible for this repair.Might be best to make this as idiot proof as humanly possible to prevent or minimize issues with this.Maybe also setup an inspection in the fall after leaves have fallen to check this specifically along with rest of property.

City codes prevent me from, say, converting a house garage into a dance/commercial video studio. -- Short/medium term low cost of living and long term passive income.--  Pursue art full time within the next 3-7 years. 

If this person is unscrupulous, what is preventing them from entering information from a friend (or some other hapless victim)? 

There are laws in place for some state that prevent evictions or delay them until after teh cold months have passed.

Can the park manager prevent me from doing this? 

Before I do that, I was wondering if anyone knew of any general laws or restrictions which prevent this?

For Sale by owner, Sales Agreements.
I’m curious to learn what clauses or protections others builds into their sales agreements to ensure (or allow for legal action) if a private seller sells their property to someone...

Lesson learned.I ran it by the agent and said I'd like some language protecting me in case the roof isn't fixed in a timely manner as it may prevent lender from giving the go ahead.

Im prepared for alternatives should the personal loan prevent me from refi due to credit limitation.  

Only that you must establish your intent to hold for investment.But nothing prevents you from later converting a property held for investment into your primary residence.