I’ve been looking to move into something bigger but recently found that another unit in my building will be going up for sale, unfortunately it’s the same exact layout, however it has roof rights which would give me some private outdoor space and possibility to build up 1 day.  

You’ll find these have identical layouts, making it very easy to renovate, easy for maintenance, and the basement can become storage and laundry for extra income.

The EXACT same house layout, but upgraded exterior and interior, sold in the lot 15 ft to the North for 96k last May.

Older homes (built 1990-2005) with similar layouts are 200-250. 

The receptacle layout may be designed for intended utilization equipment or practical room use.

I am always watching rents in the area though, frequently looking at trulia/padmapper/apartments.com/zumper/craigslist ads and snap a photo of every "for rent" sign I see to call up and find out.There is a lot more variation than simply how many bedrooms a place has and where in the city it is located in, property condition, layout, density, and the environment around it factors into the price a lot, and rentometer doesn't give you much insight into that.

Look at the RECENTLY SOLD PROPERTIES having similar layouts (number of bedrooms and bathrooms) that are within a reasonable radius, of the Subject Property.

Here is the layout,, Main house has 3 units and there is a stand alone cedar log cabin 920 sq ft. (4 units total - 2 separate dwellings) There is also a two level garage that is attached to the main house.

depending on the lot size and layout, it may or may not be feasible. 

Experienced landlords do this intuitively and spend a lot of time collecting information to make the best decision.