Probably 8%+ mortgage interest at 40% down to make a safe assumption.

I saw once where a developer gave the buyer a pass on paying HOA fees till a house was built on a lot. 

I recently signed up for BP and found the calculators on this site to be very helpful.  

One tenant is behind on rent and has still not paid December rent.I’m seeing mixed things online but looks like I have to file something by the 31st?

However, just get in, see where you fit, and build over a decent pace where down the line you will be doing great.

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@Alan Mills You mention contractors not keeping a time line , not General Contractor . 

Depends on if you have panels, crazy layouts, etc.

Fortunately lenders are starting to seeing the bigger picture and comp these additions more in-line with multi-family, rather than SFH which it is. 7842 Lasaine Ave, Northridge.

@Chinku Chinku the rich get rich by making their money work for them.They borrow at one rate, to invest in something that returns a higher rate - they profit on the difference.Only you can evaluate your risk tolerence though.