If your lease says they can't add a pet or move in a family of four without your permission, you need to know how to enforce that.

He holds the master lease to the property and it is his primary residence, with my permission he rents the second bedroom on AirBnb, all I had to do was sign a waiver for him to be able to obtain a STR permit.

If they tell me the house is listed, I "ask permission" to keep them on the list "just in case" the house doesn't sell or things change for them and they need a quick sale.

I would double check with the city, remember, trust but verify.Here's a link https://www.phila.gov/services/permits-violations-licenses/a....I'm doubtful that this scope of work doesn't require a permit.I do my jobs with permits because I'm risk adverse.Its easier to ask for permission than beg for forgiveness.Best of luck 

Therefore, I do not need to ask for his permission to hang a rose trellis on my side of MY fence. 

There was a guy on BP who tried to get one going down by Colorado Springs awhile ago called Bonsai Village and got as far as buying the land, but could never get permission due to NIMBY neighbors  and it got stalled in legal red tape until the  land eventually ended up being foreclosed on and turned into open space.

What I read here Tiffany is a person who has come to really know herself, who gave it a go, knows what she does not like, but is more-so asking permission to feel what she is feeling.     

So, other than an arbitrary law granting permission to do a thing, you can find any competent, skilled person to help you do the thing, or if you are competent and skilled, you can always do it yourself

I reached out to the owner, who gave me permission to walk it.

If he wants to do them on his own then he can get your permission.