Then if the STR is performing well, I would make the LTR a STR when the tenants move out. 

Commissions are too high and Realtor's do not do what they once did.

I highly recommend that any investor in Canada  find a similar database as well. 

You therefore have to research well on the market before you consider this kind of investment that requires town location without too high prices but attractive earnings at any given time.Cities such as Dallas-Forth Worth, Charlotte, Indianapolis, and Atlanta have varied job prospects and available affordable multifamily properties.

I do not know any realtor that would sell this property for 90k over the true value Also 12k for two furnaces is 8KISH to high.

Properties located in areas with high crime rates may be less attractive to potential renters or buyers, which can lead to lower property values and rental income.Neighborhood DemographicsThe demographics of a particular neighborhood can impact the demand for housing and rental properties.

High energy in your post, but tread carefully.

If the tenants are currently there and performing I'd do whatever I could to keep them. 

At a very high level a property has a “tax basis”, once you exceed that basis you are subject to taxes, whether that happens when sold and paid in full or paid over timeThe loan provided by seller financing is like any type of loan where the interest is taxed at ordinary income rates.

I will be leading the charge on building a scope of work, (if needed) reaching out to my extensive database of subcontractors for quotes/work, making selections/choosing materials, and the main one performing most of the hands-on labor, while teaching him (who has no experience) how to do these tasks.