Photos of the roof on a 99 yr old house and I do not know what to do.

We put a new deck, fence, roof, quartz countertops, vanities, flooring, paint and more.Before 3D https://my.matterport.com/show/?

While this currently isn't primed for investors, the financing aspect of proportional shares is interesting.   

I am going to replace roof, but there is some type of mold on sheathing ?

Then they will put the doors in next, before they do the roof.

So your profit is $245k minus $200k purchase price or $45k. minus any major documented upgrades (new ac, new roof, etc…)Then you’d pay your tax rate on that $45k.

The roof also was coming apart. 

Next time you visit make sure the roofs are good on both structures and clean the gutters.

I do only rental rehabs taking a 1975+ split level 3/2 and just causemetic;  paint, fixtures, flooring, new HVAC, rarely a roof, never windows,  paint the kitchen cabinets with new hardware, clean up baths, just clean up landscaping, fix things beyond replacing all ceiling and plumbing fixtures (except shower valves) and this has grown to $25k is now tight

Oftentimes, landlords want to sell when the big items start needing to be replaced, roofs, HVAC, sewage lines, electrical/plumbing etc.