Pili labiekārtoja sākot ar 1622.g., tika uzcelts arī kaļķu un ķieģeļu ceplis. Pēc Ziemeļu kara pils bija daļēji nopostīta un 18.gs.1.pusē, daļēji izmantojot vecos mūrus, tika uzcelta jauna ēka ar maziem stūra tornīšiem, kuriem bija barokāli kupoli. Pils saglabāja viduslaiku pilīm raksturīgo noslēgto pagalmu, bet vārtu tornim uzbūvēja jaunu augšējo daļu. Plašāka būvniecība notika 19.gs.sāk., kad tika pieaicināts arhitekts Johans Dāvids Šulcs. pilī notika remontdarbi un no šī laika fragmentāri saglabājusies interjeru apdare. Pilī 1.stāvā redzami arī 18.gs.sāk. sienu gleznojumi. Pilsmuižas kompleksā ietilpst plašs saimniecības ēku komplekss, kas novietots nedaudz atstatu aiz kādreizējā aizsardzības grāvja. Kopā 1864.g. bija 46 ēkas, to skaitā kūtis, kalpu mājas, staļļi, manēža, trīsdaļīga oranžērija, alus darītava, “Šveices māja” u.c. Kopš 1996.g. Jēkabpils Vēstures muzejs. Krustpils or the Castle of Cross possible building dates are 1231 or 1237. In 1577, Moscow army carried the enemy's position and blasted the castle. Nicolaus V von Corf started to accommodate the old mediaeval castle for the needs of inhabitors in 1622. After the Norther War castle was partly destroyed. The new castle was built using old walls in the 1st half of the 18th century. The new building with its Baroque style small towers on the corners still preserved the closed yard - so typical for the medieval castles. The old gate-tower was reconstructed and after got its present new top. Much wider works were done at the time of Nicolaus X von Corf - Marshal of Courland Knighhood at the beginning of the 19th century. At this time works were managed by architect Jochan David Shultz. Nicolaus XII continued renovation and rebuilding in the 2nd half of the 19th century. There still preserved some fragments of original interiors decorative finish from that period. Wall apintings dated with the beginning of the 18th century were discovered in the ground floor.
