Tenant build a ramp in backyard

[Jaimie Chen]

I will make the story short.  I just found out today my manager agreed (on my behalf) my tenant (a year ago) to build a bmx ramp in back yard.  What should I do? Should I let him build or tear it? He already in the middle of project.  I talked to my tenant over the phone first time today and found out a lot of surprises.  No body like these kind of surprises. 

SFH is on DFW area, has 6ft wooden fence, no HOA.

1st, fire manager. take over the job and meet tenant. 

2nd, ?

Any suggestion?