Late last year, after years of delays and disputes, the Champlain Towers South Condominium Association began a desperate search for $16.2 million to fix major structural damage that was slowly threatening the Surfside high-rise — and that may have contributed to the building's partial collapse June 24.

The obvious place to look was the building's reserve fund — extra money socked away to cover the cost of future repairs. But the account held just $777,000, according to condo board documents — nowhere near enough to soften the blow.

The collapse, which killed at least 54 people and left 86 others missing, occurred before the condo board could collect the needed money from residents and begin repairs. The cause of the collapse is unknown, and investigators, experts and advocates are trying to determine whether the uncompleted repairs played a role, whether the board could have seen the problem coming earlier — and whether a Florida law regulating condo repairs that was repealed a decade ago could have made a difference.

One way to keep track of needed repairs is a "reserve study," in which condo boards bring in experts like engineers or certified specialists every few years to inspect buildings and estimate how much the boards should collect from residents to prepare for future fixes. The building's financial documents, obtained by NBC News and NBC Miami, show that Champlain Towers South had not done a professional reserve study since at least 2016. That decision was legal, but it meant that planning was left to the board, a shifting group of volunteers with little training in building maintenance.

"If the owners would have had a reserve study, if the board was proactive and had funded its reserves, this never would have happened," said Julio Robaina, a former Republican state legislator.