Down payment with Heloc

[Ralph Ace]

I want to purchase an investment condo for $150,000.

I want to get Heloc loan from my other investment condo for $50,000 and use it as downtown payment for this condo.

Can I get a 30 year fixed conventional loan for $100,000 and use $50,000 for down payment from heloc?

I also want to combine it to one $150k  30 year fixed loan instead of having two separate  $100k and $50k loans 

what options do I have can anyone help.

I don't want to use my own money.