For residential multifamily properties (1 - 4 units), can you use a home warranty to take care of the repair costs associated with rentals?

Most sellers are going to want 20-25% down as it’s going to cost them 10% to sell.

If you have a good FICO, a decent down payment and closing costs, go ahead an do the first one. 

Even still, it could be said that I've still lost money due to my time on the tools instead of prospecting as a real estate agent (the cost of lost opportunity).If you can truly do 80%-90% of the work yourself (at acceptable quality levels) and you aren't sacrificing your time where you can get better returns for your efforts, then yes, it can work even up here in Canada.

However, I still struggle to understand the art of estimating rehab costs. 

You will also need about 6 months of reserves deposited in a traditional financial institution rather than a crypto account.The next step is to find the target property and calculate the acquisition costs and costs of construction along with the after-repair value. 

Procrastination will only cost them more. yep. carrying costs alone, but also if its not your money and investor money - some will try and drag it out. 

That can be expensive and will likely cost between 15 and 20% of the revenue (and that doesn't often include the cleaning fees) which may mean that you don't make a profit. 

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Since we aren't in that state it would cost more because we can't physically be there to track projects, network for contractors etc.