@Hector Lewis - The decision ultimately depends on your current cash reserves relative to your financial needs, as well as your willingness to reinvest for potential appreciation.

Different areas have different metrics that decide how well they are doing.

A good rule of thumb is to have 3-6 months of expenses (mortgage, utilities, insurance, etc.) set aside per property for emergencies.

As stated previous neither lender would want to take the second position as well. 

You know much more about Vegas than I do, but winters are colder here and summers are cooler as well.

Then add any other codes required where you want to build and study those as well.

Largely, the appreciation in housing prices is coming from both new migrants and investors coming from the East (GTA) as well as international countries (predominately from the middle east).We are also seeing drastic increases in the rental rates which in turn are pushing investment property prices up as well.

That "pipe" is known as a Line Set. 

They made contact with me as well but I don't want to get sucked into a scam. 

In addition to the interest of the loan, you'd also be paying this as well.