24 C.F.R. § 972.236
Although a PHA will submit its conversion plan to HUD as part of the PHA Annual Plan, the conversion plan will be treated separately for purposes of HUD approval. A PHA needs a separate written approval from HUD in order to proceed with conversion. HUD anticipates that its review of a conversion plan will ordinarily occur within 90 days following submission of a complete plan by the PHA. A longer process may be required where HUD's initial review of the plan raises questions that require further discussion with the PHA. In any event, HUD will provide all PHAs with a preliminary response within 90 days following submission of a conversion plan. A lack of a HUD response within this time frame will constitute automatic HUD approval of the conversion plan.
24 C.F.R. § 972.236