Income earned by a retirement account will not be reported on your individual return.The way it will impact your return is when retirement account funds get distributed to you personally. 

We considered forming an LLC and sharing capital that way, but we know that lenders prefer to loan to individuals rather than LLCs with no income.  

But there could be individual circumstances where a hold period of less than that might be appropriate. 

I have more in the early stage than I will in any individual unit.The insurance is pricy as well.  

Google "IRS EIN" for the link or go to https://sa.www4.irs.gov/modiein/individual/index.jsp (current link today) Remember that every year you have to file a "no tax due" or your account becomes in bad standing (that happened to me once when I forgot).

At the same time, begin to build a brand on LinkedIn because this is likely one of the highest concentration of high net-worth and high income individuals anywhere online.1.

@Jennifer Nowak, I recommend QuickBooks Online (at least Plus) because: 1) QBO can be set up/manipulated to track flips and rentals separately as well as each property and entity individually all under one subscription (Location = Entity; Class = Property; etc).2) QBO has a better bank feed system than other software due to their secure relationship with a ton of banks.

Since we are building individual units we have to consider impact fees for each unit for the city and water sewer and water line for them to have there own meters.Once permits are approved, we estimate the first model to be done in 2 months.

@Lukasz Lebensztejn If you mean individual mobile homes (rather than parks), I’m happy to help!

Per usual consult an attorney or tax professional for your individual situation.