Charging more than fair market rent with anything credited to the sale price (which is unknown) is a DF matter.

This will protect you against unknown liens, etc.

The safest thing is use a higher amount for unknowns such as interest and points.Then if the actual quote is less than what you budgeted, you pocket some savings.If you are new to this business, it is best to not start with aggressive outlooks on estimates, carrying costs, etc.  

Lots of unknowns here, but I'll pipe in.First off, $750 for $50-$75k after a rehab doesn't sound that great. 

Mainly because without deep level knowledge those unknown little mistakes add up to big amounts of lost money ( a compounding effect ).The same holds true when when you are an expert in something in that you catch almost all the little things that can really eat into your success with an investment.

if you cannot get everyone to vacate the property and you are not willing to try and work with whoever is left in the property then you will need to name the tenant along with "any and all occupants", "unknown occupants", or "others" in the pay-or-quit notice and also the court documentsI usually always include "Others" just to make sure all bases are covered since many tenants like to move in other people, pets, boats, trash, etc without telling me which I am then left to clean up.

Now whether the Rams are the team that plays in it is the big unknown.

Had another buried tank unknown size and they cared.

I would build your analysis knowing what you know...and leave some contingency for the unknown.

The property might not comp out for much given the condition and location (which are unknown).