Cut neat holes that are easy to patch.

I know in theory the process of BRRR, Buy & Flip, Buy & Hold, et... but I am very worried about screwing it up and really putting myself and my family in the hole ( I have a wife and a 1 year old son).

Another item that can run you upwards of $30k if you ended up buying a sink hole that needs tons of fill dirt.

Hows the overall condition of the property > If the appraisal is marked subject to it won't be able to go conventional or DSCR It needs flooring (bad carpet) painting and there is a hole in the side of a fiberglass tub.

This type of survey is crucial for ADU projects because it reveals the lot’s contours, slopes, and elevation changes, which are vital for foundation design and drainage planning.

Wouldn’t call it a loop hole.

I can improve this later in life and fill in the pond and put the drainage under the parking lot.Contiguous land isn't an option right now. 

I know in theory the process of BRRR, Buy & Flip, Buy & Hold, et... but I am very worried about screwing it up and really putting myself and my family in the hole ( I have a wife and a 1 year old son).

Look for abnormalities in the area - even small holes and cracks can be problematic.'

Quote from @Tatenda Mpofu: A quick search suggested that the following surveys could be completed in the diligence phase of self storage facility acquisitionBoundary Survey: ALTA/NSPS Land Title Survey: Topographic Survey: Site Planning Survey: Floodplain Survey: As-Built Survey: I'm curious which of these are necessary versus nice to have ALTA/NSPS is critical, topo is useful for understanding drainage but some details can indicate that on an ALTA if you specify on Table A. topo needed if you're going to build anything on the excess land.as builts are quite useful for improved property.