I mainly want to ask if these assumptions are reasonable and if there's anything I haven't considered:(1) multifamily units in NJ close to New York City, ~$1,000,000, 20% down payment, (2) Using the following assumptions: 4% appreciation rate, 6.5% interest rate and 5.0% refinance after 5 years, $10,000 yearly maintenance fee(3) ~$6,000 monthly rental and assume 3% increase yearly with 5% vacancy rate(4) Based on the above, the calculated IRR if selling at the 10th year is ~19% (considering tax benefits) and ~17% (without tax benefits).

The stone elevation can be expensive but will really move a house quickly with the added curb appeal.Some things I like to add for not much extra cost..

on a 100 year old house that rents for $1000 a month that's about to need a new everything - that is spectacularly deficient.  

Just keep in mind the process can take a little longer since you’d need to work with contractors and follow FHA’s requirements.4.Your End Game: Whether you’re planning to stay long-term, rent it out, or sell once the work is done, it’s important to have your exit strategy mapped out.

We just fixed up the house and have it on zillow with several applications in 24 hours. 

Quote from @Charles Evans: I'm a new house hacker here.

Maybe they have other properties they are interested in selling without a Realtor involve.

I kind of like the idea of wholesaling out of state leads, however, with subj to i would be VERY careful who you sell those to. 

I also have a mortgage on this property paying $683 a month.Now I'm deciding should I continue waiting for a possible tenant or should I just sell the property.

I believe depreciation on that unit that you were living in starts at that point as well.just bringing this up because it was mentioned in another post where someone was house hacking.