As a long time DIY landlord,  I have learned the hard way how to do most any remodeling or repairs on my properties. 

A place can be completely gutted and remodeled, but because it wasn't torn down it still shows the original build date.

Is there anything I can do to ideally get them to not list the house and sell to me, I’m assuming there might not be many options, especially since the sister and I had agreed on a price that was below market value given I was planning to invest money to remodel the home and was planning to honor his wishes of not having the home knocked down to make a townhome or new home.

They will get a complete remodel with new kitchens and baths.

A better way to approach this is to ask and investigate what Remodelers and Renovation companies charge. 

#1 family home we’ve remodeled into a vacation home. 1.5 years in the books. 

Bought a duplex, completed a 9 month BRRR, and finished a cosmetic remodel on another single family.

Remodel both bathrooms and kitchen.

Construction time and budget rarely stay as planned, especially with a remodel. - I'm OK with 5th ward.

I outsourced and had a really good realtor with amazing sources.We finished remodeling in 3 weeks.