@Giovanni Branch The 1% or 2% "rule" is IMO only good to determine if you will dig into the analysis a little more. For example, if you have a purchase price of $200k and the listing says they are getting $1500/mo this falls well below the 1% rule at 0.75%. I personally wouldn't spend much time on the property. Unless I believe there is a lot of room to get rents up.
The 1% (or 2% in some markets) is a rule of thumb because when you go under 1% it is unlikely the rental income will cover all of the expenses you need to account for. Not certain it won't but pretty good chance.
In your example, $100k purchase and $1k/mo in rent you hit 1% on the dot. This warrants going into the analysis deeper. Hence then busting the calculator out and breaking down the expenses. Typical expenses are going to be the following:
Mortgage PITI (principle, interest, taxes, and insurance) - this number is based on the taxes of a particular property and the financing you get. those numbers should be pretty easy to estimate or know exactly
Maintenance - A good starting point is 10% of the monthly rent. However, this could be lower if its a very new build or recent reno
Vacancy - Different markets and properties will have different vacancy rates but I also use 8% of the monthly rent because this assumes you will have 1 month a year without a tenant in the building
Capital Expenditure (CapEx) - I start with 5% of the monthly rent here. Again it could be higher or lower depending on the condition of the property
Property Management - 10% of the monthly rent is pretty standard
Utilities - this totally depends on lease agreements and the standard for the area
I would consider all of these the most conservative numbers to start with and are what I plugged in for your property. Based on these expenses you will only profit $28/mo on this investment. That is not a great return on your money. But don't just trust my numbers.