All are 3 bedrooms within 500 meters of my property.

The plan is to build on top of my 1-story garage to create a 750 sq.ft. 1-bedroom apartment.

Its a duplex 4 bedroom 2 bath located in Jersey City, asking price 480,000.

Once the construction aspect is finished, the building will be rented out, with each unit containing 2 bedrooms and 1 bathroom.

The upstairs is a two bedroom (rent is $2325 with parking) and the downstairs is a one bedroom (rent is $1830, no parking).  

It is a 4plex with 3 1 bedrooms and 1 2 bedroom.

Purchase price: $161,200 Cash invested: $1 Duplex with 3 bedrooms and 1 bathroom per unit.

If my math is right you could almost double a properties income potential by adding an Accessory dwelling unit which will probably cost less than 10-20% of the initial home purchase price.Example:SFH purchase: $400,000 renting at around $2,100-2,500 (after about $5,000 updating)Garage Conversion: 25,000-100,000 (maybe less if I can find one with a bathroom next to the garage)1 bedroom renting near Fairfield CA: $1500 monthA lot of these numbers are idealized but this could bring the Property near to the 1% rule.400,000+25,000+5,000 = 430,000(2500+1500)/430,000 = .93%Now if we get this to work and we take it a step further and add a second ADU to the backyard for 100,000-200,000 we could add a 2 bedroom and add more incometotal cost: 430,000 + 150,000 = 580,000rent for 2 bedroom: 2,000Total income: 6,0006,000 / 580,000 = 1.03 %Do these number look relatively reasonable to anyone that has more experience with adding adu's in California?

When we purchased this house decades ago, it was apparently assessed as a 2 bedroom house.

Sale price will be a little below market value with a Home Style loan (4% down), rehabbing ($80K-$100K) mom's home into a place my family and I can live in (better schools, bigger yard, and other benefits) comfortably with a growing family.We plan to renovate the attic of our current home and make some cosmetic repairs ($60,000 HELOC) that take it from a 3 berooom 1+ half bath to a 6 bedroom 1+half bath with a separate 1 bedroom apartment that has a livingroom and kitchen (apartment is already renovated).We then plan to rent the Air BnB for 2 years and re-finance for equity and leverage to buy more rentals.