Are they being professionally managed or DIY managed?

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Many cost segregation study professionals will offer you a free quote on the cost of the cost seg study specific to your property as well as the potential tax savings.HOW LONG DOES A COST SEGREGATION STUDY TAKE?

I would recommend an STR for the best tax benefits and cash flow no doubt.

Even professionals “short cut” the process and invest without almost any research.  

Have also used list source and prop stream before but the data they provide is very similar to what I pull off the tax records through CRS Tax. 

I have 2 options:- finance the construction pre-selling the apt, and take my profits (expected to be around 700K pre-tax); or- finance the construction with a 6-7%/year loan (collateral = my house), keep the 10 units, and once the building is completed in 24 months, rent them for circa 180K/ year gross.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Check with your tax professional about your ability to deduct the interest on a HELOC from your taxable income.2.

Make sure your financial advisor understands real estate taxation, financial planning and tax planning.