“If I sold, and after closing costs, maybe net $75K (simple round math), how else could I invest that $75K to get a larger return?” 

He is putting 30% downi have a 3 step plan and would love to hear your opinions on this (my math is generally super conservative): A) Split the houses in half and have (2) 3 bed 1 bath and (2) 2 bed 1 bath units  ----spend about 60k on 2 new kitchens, a couple interior walls, and 2 new meters      - this would flow about $8000-$9000 total, and bump the value to about $1.5mB) Pull plans for 3 additional units or for new 5 units (would have to demo the rear unit) ----spend about $20k on paperwork      - this would bump up the value to about 1.6-1.65m C) Build the new units assuming all 2 bed 1 bath 800s.f. on 2 stories 400k-750k      - Each new unit would flow about $2200, bringing the total to about 14,500 - 16,000, bringing the value up to 2.75m @ 4.5% capGenerally speaking, 2bed 1 bath in that area goes for about $2500+, way undershot for safety purposes What part of my plan would be the best part to sell at? 

Simple math says I will generate $3,000 on my investment versus your 900. 

What math needed?

(around 400 Euros in social security and accountancy fees) so you would need to do the math to make sure the tax savings exceeded the costs for maintaining the S.L. 

My condo's pricing will decreaseBy doing simple math and writing down the pros and cons, the obvious risk adverse option is (1).

@Jaron Walling I can say this majority of families are nurse the environment not so much of a problem, I'm not a reader or math person that's another thing I'm more visually and and hearing, and I did go to a program that could help people find jobs but they suggested I do clerical which is office work I don't prefer office work and that job is not going to be around long time before automation takes over, and my two problems I have eye problems and and I wear hearing aid, I try to become a mechanic I even tried to become an Uber driver and all that time I had three interviews and they all turned me down as got home from each one of them.

Is there any laws you can send me about that so I can do my homework plz

I like math and have experience building scripted number crunching spreadsheets in excel.

Since you did the math and figured you would live in an $800+ unit for a bit over $200, all while controlling a $400k asset with tax benefits means it still accomplishes the house hacking goal.