...Sale Date: Week of April 29 Series: $89,880,000 Unlimited Tax School Building Bonds, Series 2019 Purpose: To construct, improve and equip school buildings throughout the Northwest Independent School District (Northwest ISD, or the district), as well as to pay issuance costs. Security: The bonds are payable from an unlimited ad valorem tax levy and are further backed by the Texas PSF bond guaranty program. For more information on the Texas PSF see "Fitch Affirms Texas PSF Rating at 'AAA'; Outlook Stable," dated July 21, 2017. A change in Fitch's assessment of the Texas PSF bond guaranty program would automatically result in a change in the rating of Northwest ISD's series 2019 unlimited tax (ULT) school building bonds....