Are HELOC based off Tax Accessed Value?

[Nik Moushon]

I am working with a bank on a construction loan for a duplex. I need between $20-25k to put up as a bond for the utilities (long story but the city has required it). My problem is that I need this money so the city can finish the short plat. Then I cant get that back out of the construction loan in the first draw but the loan cant be approved until short plat is approved and I cant get the short plat approved until the bond is up (nice catch 22). So I have to come up with the cash, on top of the DP for the loan, and was going to do a HELOC on my current rental property to come up with that cash for the short term.

From my understand of HELOC it was all off the equity that is in a said property and you find out what equity you have by doing an appraisal to find what the market value would be. Then take a X% LTV on the equity in the property. I went to the bank I'm doing my construction loan with and they told me something completely different. For a rental property they take 60% LTV of the TAX ACCESSED VALUE of the property minus the remain loan amount. So for my rental it would require the value to be over $400,000!!! ($400,000 x 60% LTV = $240,000 - $215,000 (remaining loan) = $25,000 HELOC amount) The TAV of my rental is only $155,000 when I bought it for $235,000 2.5 years ago.

This is so *** backwards from everything I've read I'm starting to wonder if I have miss understood HELOC this entire time?! So have I sorely misunderstood HELOC or is this really as far out there as I'm seeing it?