If you only have 25% equity in the other property and no cash, then that probably will not work as its too risky for the lender unless you also have other properties to secure it with.

Lenders WILL allow a secured loan ( like a second mortgage, HELOC, Cash out refi loan).

Second example: I purchased a first lien note secured by a very run down shopping center in which the principal balance was $470,000 - I paid $255,000 for the note.  

For this deal, my mother and I secured financing through a Debt Service Coverage Ratio (DSCR) loan, which allowed us to borrow based on the rental income potential of the property.

A double security deposit can. 

I'm actively purchasing multiple properties and would like to leverage hard money loans with terms typically ranging from 1.5 to 2 years.My primary focus is on securing financing that aligns with my investment goals while ensuring that the rates and terms are the most favorable.

I was able to to secure a loan. 

Plan is so that he can retire and him and my Mom can be financially secure on rental income while my sister and I manage the properties in the trust. 

I called VRBO customer service and was told, "Well, you have a security deposit. 

Regarding security with buying the property, I can't say I'm too worried about that.