Started out being 2 units enlarged to one bigger place.

That enlarges your entire pool of potential buyers. 

I have a brrrr i am current in the rehab stage on and need some advice.The house is on paper a 3bd 1 ba row home. in an area where within the 2 neighboring streets all of the home layouts are exactly the same. nice solid brick construction row homes of same size and layouts.heres my problem... one of the bedrooms and the only bathroom extremely small. a I am seriously considering enlarging the bathroom into the small bedroom to have a normalish size bathroom and a hall closet in exchange for the tiny bedroom.The tiny bedroom is so small that the township considers these houses 2 bd units and therefore only allows 4 people to occupy them but when the home values are appraised they are appraised as 3bd homes.

Below is a table of the metrics that I look at for several markets(click on it to enlarge it).

Now this is why I suggested enlarging an existing unit , keeping it as "3" units you become a roomate , your section is behind a locked door , and you and your "roomate" share the same address .

I'm somewhat living my ultimate goal right now, my growth plan is to enlarge my multifamily portfolio by a few thousand units over time.It's hard to imagine that I started with a single property with some seller financing (because I had no money) 24 years ago to having just bought my 630th property last week.

How about moveable walls that could shrink tenant space when you were away (giving them a credit) and enlarge their space when they had a family function (debiting their account).

They are pretty much identical but this house has a small addition on the back that enlarged the bathroom.

If you want to see the below image as enlarged, click it.

Dark colors always shrink the sq footage whether, doors, trim, cabs, floors etc. while white or light enlarges space.