I would make sure the work already done was inspected including whatever supports the second floor.

Will you be affected by the new Salem AirBnb rules taking effect in April?

Income Evaluation No of Units Unit Rate Income       2 Bedroom Unit A 1                 650.00                                    650.00           2 Bedroom Unit A 1                 650.00                                    650.00 2 Bedroom Units A 1                 650.00                                    650.00 2 Bedroom Units B 1                 650.00                                    650.00 2 Bedroom Units 1                          -                                               -   3 Bedroom Units B 0                          -                                               -   Garage Units 0                          -                                               -                  -   Storage Units 0                          -                                               -   Laundry Units 0                          -                                               -   Comm Units 0                          -                                               -   Comm Units 0                          -                                               -   Comm Units 0                          -                                               -   Total Monthly Income 5                                    2,600.00 Total Annual Gross                              31,200.00 Total Annual Cost / EBIDTA                                9,911.86 Net Cash Flow (Annual)                              21,288.14 Net ROI 42.39% Monthly Cost of Operation By Landlord By Tenent Monthly Annually Monthly Taxes x                                       137.50             1,650.00   (From Historical Data) Montly Space Rent (MHP)                                                -                            -   N/A Monthly Insurance x                                       100.00             1,200.00 Calc'd Monthly HOA                                                -                            -   Posted Monthly Water/Sewer   X                                       320.00             3,840.00 Estimated Monthly Garbage X                                       160.00             1,920.00 Estimated Monthly Electrical X                                                -                            -   Tennant Monthly Heat/Gaas   X                                                -                            -   Tennant Monthly Other Utes x                                                -                            -   N/A Monthly Yard Maint x                                         20.00                 240.00 Estimated Monthly Maint - Op Ex x                                       260.00             3,120.00 Calc'd - 10% Cap Ex x                                       260.00             3,120.00 Calc'd - 10% Monthly Vacancy x                                       182.00             2,184.00 Calc'd - 7% Screening/Tennant Management x                                         20.00                 240.00 Estimated Monthly Management x                                                -                            -   At Risk - Self Manage MONTHLY OP EXP                                   1,459.50 Total Annual Expenses                                 17,514.00 Total annual Debt Service                                   8,452.36 Net Operating Income NOI                                 13,686.00   Net Income                                       5,233.64 ROI % 10.42% Low/Average CAP Rate (Net Income/Purchase) 2.92% Extremely Low  Cash Flow per Door                                       109.03 Very Low  Tax Assessment  Estimated Expenses - 50% Rule                                       159.50 Conservative Banked Amount - CAP Ex, Repairs, Vacancy                                   8,424.00

If your planning on using the land for an additional building, I would call the local planning dept and make sure that the property can support it.

They did all kinds of crazy stuff back in the day, so I don't rule anything out.

@Ashish Acharya IRS Interest tracing rules allow you to deduct business interest related to the manor it was used, not where it was originated. 

Depending on the type of property and the market the 50% Rule is usually fairly close for expenses.How accurate is your ARV? 

It is likely the the Magistrate will rule that the temant has equity due to the option money he paid and will require you to foreclose.

He's telling you to wait a week because you're going to go look at cars in person, or put your contact info on some website, to "think about it" a week earlier than whatever he tells you (this is 100% true, and as a lender I will not believe you if you tell me otherwise... sorry :P ), and the second you walk onto that car lot a bunch of car salesmen are going to descend upon you, deploying various lines of BS as a pretext to run your credit ("it's a soft pull" or "we just need your SSN to verify you aren't a terrorist, we aren't going to run your credit") and close you on a car that very day, and there is greater than a 0% chance you will believe what they tell you and screw everything up.The rule is that whatever you tell homebuyers not to do, some non-trivial percentage of them are going to push it one notch farther than you tell them.

I'm fairly confident that with modern upgrades the house will support that valuation and command high rents.